Surnames are from different periods in the 19th century unless otherwise stated.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
O
| Surname | Town County Partition | Comment |
|---|---|---|
| Obacz | Malow, Trembowla - Galicia | |
| Obacz | Trembowla - Galicia | |
| Obalek | Ligota, Ostrow Wlkp - Prussia | |
| Obara | Konopnica, Lublin - Russia | |
| Obara | Majdan Krolewski, Nisko - Russia | |
| Obara | Rzeszow - Galicia | ties, 1880-1900 |
| Obara | Skrzynka - Galicia | |
| Obara | Szczucin - Galicia | |
| Obara | Wojslawice, Lublin - Russia | |
| Obarowski | Torun - Prussia | civic records, 1876-1888 |
| Obarski | Krakow - Galicia | parish: St. Szczepan |
| Obarski | Mogilno, Posen - Prussia | cemetery |
| Obarzanek | Jaslo - Galicia | |
| Obarzanowski | Krakow - Galicia | parish: St. Szczepan |
| Obas | Nagoszyn, Debica - Galicia | cemetary |
| Obczynski | Gojsk, Sierpc - Russia | |
| Oberda | Wojslawice, Lublin - Russia | |
| Oberek | Lowicz - Russia | |
| Oberek | Lowicz - Russia | Evangelical Lutheran records |
| Oberman | Filipow, Augustow - Russia | cemetery |
| Oberman | Lodz, Piotrkow - Russia | |
| Obermanowicz | Ksiezomierz - Russia | |
| Oberski | Brzezany - Galicia | |
| Oberstyn | Kawnice, Konin - Russia | 1824-1864 |
| Oberuber | Chmielowka - Russia | |
| Obida | Zielona - Russia | |
| Obidzinski | Lysakowo, Przasnysz - Russia | |
| Obidzinski | Przasnysz - Russia | |
| Obidzinski | Zielona - Russia | |
| Obieciun | Merecz (Merkine) - Russia (now Lithuania) | |
| Obiedzinski | Augustow - Russia | notary records: contracts, inheritances, purchases and sales, 1830-1835 |
| Obiedzinski | Barglow - Russia | |
| Obiedzinski | Jaminy - Russia | |
| Obiedzinski | Netta - Russia | |
| Obiedzinski | Polkowo, Goniadz - Russia | |
| Obiedzinski | Rajgrod, Suwalki - Russia | |
| Obijak | Targowisko, Lublin - Russia | |
| Oblejak | Bogate, Ciechanow - Russia | |
| Oblicki | Jaryczow, Lwow - Galicia | |
| Obliwka | Malnow, Mosciska - Galicia | |
| Oblocki | Brudzew, Konin - Russia | 1808-1835 |
| Obloczynski | Merecz (Merkine) - Russia (now Lithuania) | |
| Obloda | Nadworze - Galicia | parish: Poreba Radlna |
| Oblokowski | Janow Trembowelski, Trembowla - Galicia | |
| Obniski | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Obniski | Sztabin, Augustow - Russia | |
| Obojski | Gzy, Pultusk - Russia | |
| Oboleski | Peczniew - Russia | |
| Oboleski | Spicimierz - Russia | |
| Oboleski | Uniejow - Russia | |
| Oborski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Oborski | Krakow - Galicia | parish: St. Szczepan |
| Oborski | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Oborski | Krzywcza, Przemysl - Galicia | |
| Oborski | Slupca, Konin - Russia | |
| Obrapalski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Obrebski | Bogate, Ciechanow - Russia | |
| Obrebski | Kurowo - Russia | |
| Obrebski | Przysiersk, Swiecie - Prussia | cemetary |
| Obrembski | Gradzanowo, Sierpc - Russia | Catholic |
| Obrembski | Krosniewice, Lodz - Russia | |
| Obrembski | Mokowo, Plock - Russia | |
| Obrembski | Rozan, Ciechanow - Russia | |
| Obrengorski | Lodz, Piotrkow - Russia | |
| Obrepalski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Obrepski | Dzierzgowo, Przasnysz - Russia | |
| Obrepski | Szrensk - Russia | |
| Obrochta | Ratulow - Galicia | parish: Czarny Dunajec |
| Obrocki | Zale, Plock - Russia | |
| Obroncz | Lodz, Piotrkow - Russia | |
| Obroszko | Oborniki - Prussia | cemetery, former Prussia |
| Obrusnik | Grabowiec, Lublin - Russia | |
| Obrycki | Knychowek, Drohiczyn - Russia | |
| Obrycki | Knychowek, Drohiczyn - Russia | 1755-1790 |
| Obrycki | Wasewo - Russia | |
| Obrycki | Zielona - Russia | |
| Obrzno | Snietnica, Nowy Sacz - Galicia | |
| Obrzuszkiewicz | Znin - Prussia | |
| Obrzut | Binczarowa - Galicia | |
| Obrzut | Kruzlowa - Galicia | |
| Obrzycki | Wilno - Russia (now Lithuania) | 1742-1747 |
| Obs | Sedziszow Malopolski - Galicia | |
| Obst | Broniszewo, Konin - Russia | |
| Obst | Jelenia Gora - Prussia | Hirschberg |
| Obst | Legnica - Prussia | Liegnitz |
| Obst | Wielen - Prussia | |
| Obszarski | Leszczyny - Galicia | |
| Obszynski | Kurowo - Russia | |
| Obuch | Huta Samokleski - Galicia | |
| Obuch | Krempna - Galicia | |
| Obuch | Pielgrzymka - Galicia | |
| Obuch | Wola Cieklinska - Galicia | |
| Obuchowicz | Jezno, Kowno (Kaunas) - Russia | |
| Obuchowicz | Lejpuny - Russia (now Lithuania) | |
| Obuchowicz | Tarczyn - Warsaw | |
| Obuchowski | Augustow - Russia | Augustow county notary records, 1808-1830 |
| Obuchowski | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Obuchowski | Gradzanowo, Sierpc - Russia | Catholic |
| Obuchowski | Jezno - Russia (Lithuania) | 1787-1883 |
| Obuchowski | Krasnopol - Russia | |
| Obuchowski | Kroze (Kraziai), Lithuania - Russia | |
| Obuchowski | Lipsk, Augustow - Russia | cemetery |
| Obuchowski | Lodz - Russia | jewish, 1920-1925 |
| Obuchowski | Marcinkance, Troki - Russia (now Lithuania) | |
| Obuchowski | Nowotrocki, Troki - Russia (now Lithuania) | 1841, parish: Nowotrocki |
| Obuchowski | Przerosl - Russia | |
| Obuchowski | Rotnica (Ratnica), Troki - Russia (now Lithuania) | |
| Obuchowski | Sejny - Russia (now Lithuania) | |
| Obuchowski | Sejny - Russia | |
| Obudowski | Liskiava (Liszkow) - Russia (now Lithuania) | |
| Obudowski | Liszkow - Russia (now Lithuania) | |
| Oburski | Kramsk, Konin - Russia | |
| Obycki | Mokre, Grudziadz - Prussia | |
| Och | Dubiecko - Galicia | |
| Och | Osie, Swiecie - Prussia | cemetary |
| Ochal | Olchowa, Sedziszow - Galicia | |
| Ochal | Ostrow, Skrzyszow - Galicia | |
| Ochala | Jaslo - Galicia | |
| Ochedalski | Dzierzbice - Russia | |
| Ocheduszko | Krzywcza, Przemysl - Galicia | |
| Ochelski | Badkowo Koscielne, Plock - Russia | |
| Ochelski | Koscielec, Konin - Russia | |
| Ochelski | Wegrzynowo, Ciechanow - Russia | |
| Ochendal | Jezewo, Swiecie - Prussia | cemetary |
| Ochenkowski | Jasienica - Russia | |
| Ochenkowski | Zielona - Russia | |
| Ochetal | Rzasnia, Lodz - Russia | |
| Ochlanek | Niemyslow - Russia | |
| Ochlap | Jaslo - Galicia | |
| Ochman | Rabka, Nowy Targ - Galicia | old cemetary |
| Ochmanski | Krakow - Galicia | parish: St. Szczepan |
| Ochmanski | Peczniew - Russia | |
| Ochmanski | Szadek - Russia | |
| Ochmanski | Trebki, Plock - Russia | |
| Ochmanski | Tuliszkow - Russia | |
| Ochmanski | Zychlin, Lodz - Russia | 1850-1870 |
| Ochocinski | Wilno - Russia (now Lithuania) | |
| Ochocki | Iwanowice, Kalisz - Russia | 1790-1820 |
| Ochocki | Kutno - Russia | |
| Ochocki | Leczyca, Lodz - Russia | based on civil records, 1821 |
| Ochocki | Peczniew - Russia | |
| Ochocki | Strzelno - Prussia | |
| Ochocki | Widelka - Galicia | |
| Ochocki | Zadzim - Russia | |
| Ochojski | Kozmice Male - Galicia | |
| Ochol | Sedziszow Malopolski - Galicia | |
| Ochota | Debowiec, Jaslo - Galicia | 1746-1774 |
| Ochota | Lubasz - Prussia | |
| Ochotny | Swiatniki, Gniezno - Prussia | |
| Ochowski | Zlotkow, Konin - Russia | |
| Ochrzanowski | Badkowo Koscielne, Plock - Russia | |
| Ochwat | Jaslo - Galicia | |
| Ochylka | Krakow - Galicia | parish: St. Szczepan |
| Ociecki | Kurowo - Russia | |
| Ociepka | Rabka, Nowy Targ - Galicia | old cemetary |
| Ocik | Siolkowice (Schiolkowitz) - Prussia | |
| Ocwieja | Bielcza - Galicia | diocese: Tarnow |
| Ocysek | Fajslawice, Lublin - Russia | |
| Ocytko | Sedziszow Malopolski - Galicia | |
| Oczapski | Rusocice, Konin - Russia | 1808-1835 |
| Oczkiewicz | Jaslo - Galicia | |
| Oczkiewicz | Plock - Russia | Marriages, 1850-1880, parish: Duninow |
| Oczkowsk | Strzegowo, Plock - Prussia | |
| Oczkowski | Fordon, Bydgoszcz (Bromberg) - Prussia | |
| Oczkowski | Gradzanowo, Sierpc - Russia | Catholic |
| Oczkowski | Jezowe, Nisko - Galicia | |
| Oczkowski | Szczuczyn, Lida - Russia (now Lithuania) | |
| Oczkowski | Widelka - Galicia | |
| Oczkowski | Zielona (by Zuromin), Mlawa - Prussia | |
| Oczynski | Dzierzgowo, Przasnysz - Russia | |
| Odachowski | Oszmiany - Russia (now Lithuania) | 1906 |
| Odalski | Kutno - Russia | |
| Odasiak | Stare Miasto, Konin - Russia | |
| Odebralski | Wojcin, Strzelno - Prussia | |
| Odelski | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Oderski | Wilno - Russia (now Lithuania) | 1742-1747 |
| Odmianiska | Trebki, Plock - Russia | |
| Odminski | Gniezno - Prussia | |
| Odoj | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Odoj | Znin - Prussia | |
| Odojeski | Znin - Prussia | |
| Odolenski | Bialaszewo, Lomza - Russia | |
| Odon | Kurowo - Russia | |
| Odorkowski | Jaminy, Augustow - Russia | 1759-1800 |
| Odorowski | Boby, Lublin - Russia | |
| Odorowski | Glogowiec, Lodz - Russia | |
| Odorowski | Mokre, Grudziadz - Prussia | |
| Odrobiniak | Lipnica Wielka, Orawa - Galicia | |
| Odroski | Spicimierz - Russia | |
| Odroski | Uniejow - Russia | |
| Odrowaz-Straz | Ojrzanow - Warsaw | |
| Odrowski | Lwow - Polish Kingdom | Lviv "Grodzkie" records, 1619 |
| Odrymski | Lichen, Kolo - Russia | |
| Odrziwolski | Lwow - Polish Kingdom | Lviv "Grodzkie" records, 1619 |
| Odrzywolski | Wojslawice, Lublin - Russia | |
| Odulik | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Odun | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Odyniec | Merecz (Merkine) - Russia (now Lithuania) | |
| Odyniec | Nowy Dwor, Bialystok Podlasie - Russia | cemetery |
| Odyniec | Oszmiany - Russia (now Lithuania) | 1906 |
| Odyniec | Wilno - Russia (now Lithuania) | |
| Odynski | Zawale, Sniatyn - Galicia | |
| Odys | Krzywcza, Przemysl - Galicia | |
| Odzulek | Jadeszki - Polish Kingdom | 1700s, parish: Dolistowo |
| Oelke | Piotrowo - Prussia | |
| Oesterich | Maslaki - Prussia | Lutherans, 1857-1860 |
| Oesterle | Bielczyny (Bildschon), Torun - Prussia | |
| Ofczarczuk | Knychowek, Drohiczyn - Russia | 1755-1790 |
| Ofenbach | Kowal - Russia | by Wloclawek |
| Ofenbach | Zgierz - Russia | |
| Off | Bobowo (Bobau) - Prussia | cemetery |
| Offenhammer | Lodz - Russia | |
| Offenkowski | Radziwie, Plock - Russia | |
| Offermann | Legnica - Prussia | Liegnitz |
| Offman | Iwanowice, Kalisz - Russia | 1790-1820 |
| Offman | Szadek - Russia | |
| Offmanski | Dlugosiodlo, Ostrow - Russia | |
| Ofiarski | Jaslo - Galicia | |
| Oficerski | Trebki, Plock - Russia | |
| Ofnalski | Tur, Lodz - Russia | |
| Oftaniewicz | Merecz (Merkine) - Russia (now Lithuania) | |
| Ofterman | Czarnkow - Prussia | |
| Ogarek | Brzozowiec - Galicia | |
| Ogarek | Czaszyn - Galicia | |
| Ogarek | Jaslo - Galicia | |
| Ogarek | Sanok - Galicia | |
| Ogarek | Wojnicz - Galicia | |
| Ogarek | Zaslanie - Galicia | |
| Ogarynski | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Ogarynski | Lozdzieje, Grodno - Russia (now Lithuania) | |
| Ogdowski | Bartodzieje Male (Klein Bartelsee), Bydgoszcz (Bromberg) - Prussia | |
| Ogenski | Radzyn, Plock - Prussia | |
| Ogiela | Slone, Rabka - Galicia | |
| Ogielglinski | Krakow - Galicia | parish: St. Szczepan |
| Ogielski | Czeremchow, Ottynia - Galicia | |
| Oginski | Brzesc Kujawski - Russia | |
| Oginski | Lubieszow, Pinsk - Russia | |
| Oginski | Nienokszty (Nemeksciu) - Lithuania (Russia) | 1783-1870 |
| Oginski | Plock - Russia | Marriages, 1850-1880, parish: Duninow |
| Oginski | Sejny, Augustow - Russia | notary records, 1860-1868 |
| Oginski | Sleszyn Wielki, Lowicz - Russia | |
| Oginski | Szadek - Russia | |
| Oginski | Vilno - Polish Kingdom | Vilno notary records, 1610-1810 |
| Ogint | Musniki, Lithuania - Russia | 1817-1825 |
| Ogladzinski | Kilo, Lipno - Russia | |
| Oglendzki | Lysakowo, Przasnysz - Russia | |
| Ogloszewski | Kutno - Russia | |
| Ogniszczak | Pobiedziska, Gniezno - Prussia | |
| Ogolnik | Lodz, Piotrkow - Russia | |
| Ogon | Ksiezomierz - Russia | |
| Ogonczyk-Niedzwiecki | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Ogoniak | Obra, Wolsztyn - Prussia | |
| Ogonowski | Bogate, Ciechanow - Russia | |
| Ogonowski | Brzezany - Galicia | |
| Ogonowski | Nienokszty (Nemeksciu) - Lithuania (Russia) | 1783-1870 |
| Ogonowski | Topczewo, Bialystok - Russia | cemetary |
| Ogorek | Dzietrzkowice - Russia | |
| Ogorek | Sierpc, Mazovia - Russia | Evangelics |
| Ogorka | Siolkowice (Schiolkowitz) - Prussia | |
| Ogorkiewicz | Miescisko, Wagrowiec - Prussia | |
| Ogorkis | Sejny - Russia (now Lithuania) | |
| Ogorkis | Sejny - Russia | |
| Ogorowicz | Ostrowo Mogilskie - Prussia | diocese: Gniezno |
| Ogorzelski | Lichen, Kolo - Russia | |
| Ograbek | Pogrzybow, Raszko - Prussia | |
| Ograbek | Sieradz - Russia | 1800s |
| Ograbisz | Czeszewo, Wrzesnia - Prussia | |
| Ogrodnik | Gorzkow, Lublin - Russia | |
| Ogrodnik | Strusow, Trembowla - Galicia | |
| Ogrodnik | Zale, Plock - Russia | |
| Ogrodowczyk | Bogurzyn, Malta - Russia | 1885-1886 |
| Ogrodowczyk | Bogurzyn, Mlawa - Russia | 1870-1890 |
| Ogrodowczyk | Chamsk, Plock - Prussia | |
| Ogrodowczyk | Radzaniow, Plock - Prussia | |
| Ogrodowczyk | Trebki, Plock - Russia | |
| Ogrodowicz | Gostynin - Russia | |
| Ogrodzinski | Krakow - Galicia | parish: St. Szczepan |
| Ogrodzki | Targowisko, Lublin - Russia | |
| Ogulewicz | Berzniki - Russia (now Lithuania) | |
| Ogurek | Tarnobrzeg - Galicia | census, 1880 |
| Ogurkiewicz | Zagurow (now Zagorow), Konin - Russia | |
| Ogurkowski | Bartodzieje Male (Klein Bartelsee), Bydgoszcz (Bromberg) - Prussia | |
| Oheim | Gebice - Prussia | |
| Ohlsem | Nieszawa - Russia | |
| Ohorta | Koszlaki - Galicia | |
| Oidowski | Kowalewo Pomorskie - Prussia | |
| Ojrzanowski | Kramsk, Konin - Russia | |
| Ojrzenowski | Rusocice, Konin - Russia | 1808-1835 |
| Okal | Uscie Ruskie (now Gorlickie) - Galicia | Uscie Ruskie is now Gorlickie |
| Okap | Milejow, Lublin - Russia | |
| Okapinski | Kumow, Lublin - Russia | |
| Okarma | Hanczowa - Galicia | |
| Okarnik | Hleszczawa, Trembowla - Galicia | |
| Okasinski | Radziejow - Russia | |
| Okerta | Niewiescin - Prussia | |
| Okienczyn | Sejny - Russia (now Lithuania) | |
| Okienczyn | Sejny - Russia | |
| Okkorowski | Bielczyny (Bildschon), Torun - Prussia | |
| Okksiak | Dzierzgowo, Przasnysz - Russia | |
| Oklejewicz | Sanok - Galicia | |
| Oklewski | Karnkowo - Russia | |
| Okmianski | Wilno - Russia (now Lithuania) | 1742-1747 |
| Oknianski | Krzywoluty, Ottynia - Galicia | |
| Oko | Majdan Krolewski, Nisko - Russia | |
| Okocinski | Osiek Wielki - Russia | |
| Okocki | Sejny, Augustow - Russia | notary records, 1860-1868 |
| Okolewski | Strzelno - Prussia | |
| Okolowicz | Jaswily, Augustow - Russia | cemetery |
| Okon | Borki, Kalisz - Prussia | |
| Okon | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Okon | Prawno, Lublin - Russia | |
| Okon | Rabka, Nowy Targ - Galicia | old cemetary |
| Okon | Rajgrod, Suwalki - Russia | |
| Okon | Uchanie, Lublin - Russia | |
| Okon | Widelka - Galicia | |
| Okoniewiski | Zielona (by Zuromin), Mlawa - Prussia | |
| Okoniewski | Oborniki - Prussia | cemetery, former Prussia |
| Okonowski | Dobroslowo, Konin - Russia | |
| Okonowski | Giewartow, Konin - Russia | |
| Okonowski | Golina, Konin - Russia | |
| Okonowski | Pobiedziska, Gniezno - Prussia | |
| Okonski | Bielczyny (Bildschon), Torun - Prussia | |
| Okonski | Chelmza (Culmsee) - Prussia | |
| Okonski | Gojsk, Sierpc - Russia | |
| Okonski | Jaslo - Galicia | |
| Okonski | Kilo, Lipno - Russia | |
| Okonski | Krasnystaw - Russia | |
| Okonski | Milejow, Lublin - Russia | |
| Okonski | Radlow, Tarnow - Galicia | |
| Okonski | Sanok - Galicia | |
| Okonski | Szczucin - Galicia | |
| Okonski | Szrensk - Russia | |
| Okonski | Trembowla - Galicia | |
| Okonski | Zale, Plock - Russia | |
| Okopinski | Grabowiec, Lublin - Russia | |
| Okopski | Krasnybor - Russia | |
| Okpisz | Znin - Prussia | |
| Okraglicki | Krakow - Galicia | parish: St. Szczepan |
| Okraglis | Sejny - Russia (now Lithuania) | |
| Okraglis | Sejny - Russia | |
| Okragly | Augustow - Russia | Augustow county notary records, 1808-1830 |
| Okragly | Szczebra, Augustow - Russia | cemetery |
| Okrasa | Brok - Russia | |
| Okrasinski | Tykocin - Russia | 1890-1905 |
| Okraska | Jamno - Russia | |
| Okraska | Kiernozia - Russia | parish: Kiernozia |
| Okraszewski | Radziwie, Plock - Russia | |
| Okret | Bogate, Ciechanow - Russia | |
| Okroj | Zukowo (Zuckau) - Prussia | |
| Okruch | Chruslin - Russia | |
| Okrucinski | Chelmza (Culmsee) - Prussia | |
| Okrusinski | Kalinowka Koscielna - Russia | 1800s |
| Okrzesa | Glinik Polski, Jaslo - Galicia | baptisms, 1878-1935 |
| Okrzesa | Pogorska Wola, Tarnow - Galicia | |
| Oks | Lodz, Piotrkow - Russia | |
| Oks | Lowicz - Russia | |
| Oks | Lowicz - Russia | Evangelical Lutheran records |
| Oksa | Remigola (Ramygala), Kiejdany - Russia (now Lithuania) | 1779-1796 |
| Oksiakiewicz | Komarow - Russia | |
| Okszos | Kurowo - Russia | |
| Oksztynajtis | Sejny - Russia (now Lithuania) | |
| Oksztynajtis | Sejny - Russia | |
| Okula | Tykocin - Russia | 1890-1905 |
| Okulanis | Berzniki - Russia (now Lithuania) | |
| Okulanis | Sejny - Russia (now Lithuania) | |
| Okulanis | Sejny - Russia | |
| Okulczycki | Jadeszki - Polish Kingdom | 1700s, parish: Dolistowo |
| Okulczyk | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Okulczyk | Jaswily, Augustow - Russia | cemetery |
| Okulewicz | Marcinkance, Troki - Russia (now Lithuania) | |
| Okulewski | Melgiew, Lublin - Russia | |
| Okulicz | Lubieszow, Pinsk - Russia | |
| Okulicz | Musniki, Lithuania - Russia | 1817-1825 |
| Okulski | Chelm, Lublin - Russia | |
| Okuniewicz | Wilno - Russia (now Lithuania) | 1742-1747 |
| Okuniewski | Dzierzbice - Russia | |
| Okuniewski | Lipsk, Augustow - Russia | cemetery |
| Okupinski | Konstantynow, Lodz - Russia | books of residence, 1890-1930 |
| Okupinski | Kumow, Lublin - Russia | |
| Okupniarek | Slupca, Konin - Russia | |
| Okupny | Koscielec, Konin - Russia | |
| Okupny | Lubasz - Prussia | |
| Okupski | Dzierzbice - Russia | |
| Okupski | Krosniewice, Lodz - Russia | |
| Okuszko | Oszmiany - Russia (now Lithuania) | 1906 |
| Okuszko | Wilno - Russia (now Lithuania) | 1742-1747 |
| Ola | Ostrow Wlk - Prussia | |
| Olak | Raclawice, Nisko - Russia | |
| Olas | Krakow - Galicia | parish: St. Szczepan |
| Olasek | Sieradz - Russia | 1800s |
| Olata | Bogurzyn, Plock - Prussia | |
| Olatowski | Krakow - Galicia | parish: St. Szczepan |
| Olba | Lowicz - Russia | Roman Catholic |
| Olbinski | Golancz - Prussia | |
| Olbinski | Sieradz - Russia | 1800s |
| Olbort | Tarnowiec, Jaslo - Galicia | cemetary |
| Olbracht | Rabka, Nowy Targ - Galicia | old cemetary |
| Olbratowski | Wloclawek - Russia | |
| Olbrechtowicz | Jaslo - Galicia | |
| Olbrich | Glogowek (Ober Glogau) - Silesia | |
| Olbrych | Gniezno - Prussia | |
| Olbrych | Jadeszki - Polish Kingdom | 1700s, parish: Dolistowo |
| Olbrycht | Loszniow, Trembowla - Galicia | |
| Olbrychtowicz | Jaslo - Galicia | |
| Olbrys | Brok - Russia | |
| Olbrys | Myszyniec - Russia | |
| Olcha | Krzywcza, Przemysl - Galicia | |
| Olchawa | Kamionka Mala - Galicia | |
| Olchowik | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Olchowka | Iwanowka, Trembowla - Galicia | |
| Olchwiercich | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Olczak | Glogowiec, Lodz - Russia | |
| Olczak | Konstantynow, Lodz - Russia | books of residence, 1890-1930 |
| Olczak | Kutno - Russia | |
| Olczak | Leczyca, Lodz - Russia | based on civil records, 1821 |
| Olczak | Mokowo, Plock - Russia | |
| Olczak | Szadek - Russia | |
| Olczak | Wegrzynowo, Ciechanow - Russia | |
| Olczak | Wysocko Wielkie - Prussia | |
| Olczewski | Bielczyny (Bildschon), Torun - Prussia | |
| Olczewski | Bielsk, Plock - Russia | |
| Olczyk | Tur, Lodz - Russia | |
| Oldachim | Janowka, Augustow - Russia | 1880-1890 |
| Oldak | Rajgrod, Suwalki - Russia | |
| Oldak | Szczebra, Augustow - Russia | cemetery |
| Oldakowski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Oldakowski | Gzy, Pultusk - Russia | |
| Oldakowski | Kilo, Lipno - Russia | |
| Oldakowski | Rajgrod, Suwalki - Russia | |
| Oldakowski | Zbikow - Warsaw | |
| Oldenburg | Sierpc, Mazovia - Russia | Evangelics |
| Oldynski | Kaletnik - Russia | |
| Oldziej | Tykocin - Russia | 1890-1905 |
| Oldziejewski | Marcinkance, Troki - Russia (now Lithuania) | |
| Olear | Starzawa, Mosciska - Galicia | |
| Olearczyk | Bogusza - Galicia | |
| Olearczyk | Sanok - Galicia | |
| Olearczyk | Targowisko, Lublin - Russia | |
| Olearnik | Hleszczawa, Trembowla - Galicia | |
| Olearski | Glojsce - Galicia | |
| Olearz | Tomaszow Lubelski - Russia | |
| Olech | Czarnkow - Prussia | |
| Olech | Czestoborowice - Russia | |
| Olech | Fajslawice, Lublin - Russia | |
| Olech | Gorzkow, Lublin - Russia | |
| Olech | Kruzlowa - Galicia | |
| Olech | Ludomy - Prussia | cemetery, former Prussia |
| Olech | Przysiersk, Swiecie - Prussia | cemetary |
| Olechlowicz | Olita - Russia (now Lithuania) | |
| Olechnianis | Jezno, Kowno (Kaunas) - Russia | |
| Olechno | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Olechno | Kalinowka Koscielna - Russia | 1800s |
| Olechnowicz | Jewienski, Troki - Russia (now Lithuania) | 1841, parish: Jewienski |
| Olechnowicz | Jezno - Russia (Lithuania) | 1787-1883 |
| Olechnowicz | Jezno, Kowno (Kaunas) - Russia | |
| Olechnowicz | Nienokszty (Nemeksciu) - Lithuania (Russia) | 1783-1870 |
| Olechnowicz | Sejny, Augustow - Russia | notary records, 1860-1868 |
| Olechnowicz | Sorokpol, Vilno - Russia (now Lithuania) | 1909 |
| Olechnowicz | Surwiliszki (Surviliskis), Kowno (Kaunas) - Lithuania (Russia) | 1800-1846 |
| Olechowicz | Sejny - Russia (now Lithuania) | |
| Olechowicz | Sejny - Russia | |
| Olechowski | Baboszewo, Plonsk, Warsaw - Russia | |
| Olechowski | Konopnica, Lublin - Russia | |
| Olechowski | Zarzecze, Jaslo - Galicia | |
| Oleczka | Knychowek, Drohiczyn - Russia | |
| Oleczno | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Olecznowicz | Kietowiski, Troki - Russia (now Lithuania) | 1841, parish: Kietowiski |
| Oledzki | Bogate, Ciechanow - Russia | |
| Oledzki | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Oledzki | Krakow - Galicia | parish: St. Szczepan |
| Oledzki | Poswietne, Bialystok - Russia | |
| Oleiniczak | Goslawice, Konin - Russia | |
| Olejarczyk | Krasnystaw - Russia | |
| Olejarczyk | Troszyn - Russia | |
| Olejarz | Piaski, Lublin - Russia | |
| Olejewski | Brok - Russia | |
| Olejnicki | Deby Szlacheckie, Konin - Russia | |
| Olejniczak | Badkowo, Plock - Russia | |
| Olejniczak | Broniszewo, Konin - Russia | |
| Olejniczak | Dzierzbice - Russia | |
| Olejniczak | Gebice - Prussia | |
| Olejniczak | Giewartow, Konin - Russia | |
| Olejniczak | Gniezno - Prussia | |
| Olejniczak | Gostyn - Prussia | 1864-1874 |
| Olejniczak | Kazimierz Biskupi, Konin - Russia | |
| Olejniczak | Lichen, Kolo - Russia | |
| Olejniczak | Miescisko, Wagrowiec - Prussia | |
| Olejniczak | Orchowo - Prussia | |
| Olejniczak | Popowo Koscielne - Prussia | |
| Olejniczak | Swiatniki, Gniezno - Prussia | |
| Olejniczak | Wilczyn, Konin - Russia | |
| Olejniczak | Wysocko Wielkie - Prussia | |
| Olejniczak | Zlotkow, Konin - Russia | |
| Olejniczek | Bolimow, Lodz - Russia | |
| Olejnik | Bolimow, Lodz - Russia | |
| Olejnik | Borki, Kalisz - Prussia | |
| Olejnik | Czarnkow - Prussia | |
| Olejnik | Horodnica, Skalat - Galicia | |
| Olejnik | Iwanowka, Trembowla - Galicia | |
| Olejnik | Uhorniki, Ottynia - Galicia | |
| Olekcinski | Jaryczow, Lwow - Galicia | |
| Oleksa | Bakalarzewo, Augustow - Russia | cemetery |
| Oleksa | Rajgrod, Suwalki - Russia | |
| Oleksa | Sarnowo Zurominskie, Plock - Prussia | |
| Oleksak | Szyperki - Galicia | |
| Oleksiak | Bogate, Ciechanow - Russia | |
| Oleksiak | Nowa Olszewnica - Russia | |
| Oleksiewicz | Rajgrod, Suwalki - Russia | |
| Oleksiuk | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Oleksy | Kamionka Mala - Galicia | |
| Oleksy | Rabka, Nowy Targ - Galicia | old cemetary |
| Oleksy | Raczki, Augustow - Russia | cemetery |
| Oleksy | Tajno - Russia | |
| Olekszewski | Dzietrzkowice - Russia | |
| Olenczuk | Kolembrody - Russia | |
| Olenczuk | Plebanowka, Trembowla - Galicia | |
| Olender | Gieguzyn, Troki - Russia (now Lithuania) | 1841, parish: Gieguzyn |
| Olender | Przasnysz - Russia | |
| Olender | Walkow, Kozmin - Prussia | |
| Olendzki | Poswietne, Bialystok - Russia | |
| Olendzki | Topczewo, Bialystok - Russia | cemetary |
| Olendzki | Wilno - Russia (now Lithuania) | |
| Olenicz | Klopotnica - Galicia | |
| Olenicz | Pielgrzymka - Galicia | |
| Olenicz | Wola Cieklinska - Galicia | |
| Olenski | Hanuszyszki (Onuskis), Troki - Russia (Lithuania) | 1770-1840 |
| Olenski | Wilno - Russia (now Lithuania) | 1742-1747 |
| Oleownik | Gebice - Prussia | |
| Oles | Juszczyna, Zywiec - Galicia | |
| Oles | Krakow - Galicia | parish: St. Szczepan |
| Oles | Krasne, Rzeszow - Galicia | |
| Oles | Legnica - Prussia | Liegnitz |
| Oles | Wielen - Prussia | |
| Olesiejuk | Kolembrody - Russia | |
| Olesiejuk | Komarow - Russia | |
| Olesinski | Dzierzbice - Russia | |
| Olesinski | Glogowiec, Lodz - Russia | |
| Olesinski | Krosniewice, Lodz - Russia | |
| Olesinski | Zadzim - Russia | |
| Olesniewicz | Bogusza - Galicia | |
| Oleszczak | Augustow - Russia | Augustow county notary records, 1808-1830 |
| Oleszczak | Gostyn - Prussia | 1864-1874 |
| Oleszczuk | Chelm, Lublin - Russia | |
| Oleszczuk | Czulczyce - Russia | |
| Oleszczuk | Grabowiec, Lublin - Russia | |
| Oleszczuk | Komarow - Russia | |
| Oleszczuk | Krasnystaw - Russia | |
| Oleszek | Milejow, Lublin - Russia | |
| Oleszek | Niedrzwica Koscielna, Lublin - Russia | |
| Oleszka | Berzniki - Russia (now Lithuania) | |
| Oleszkiewicz | Nienokszty (Nemeksciu) - Lithuania (Russia) | 1783-1870 |
| Oleszkiewicz | Rajcza - Galicia | |
| Oleszkiewicz | Remigola (Ramygala), Kiejdany - Russia (now Lithuania) | 1779-1796 |
| Oleszkiewicz | Stary Skalat - Galicia | |
| Oleszkiewicz | Wilno - Russia (now Lithuania) | 1742-1747 |
| Oleszko | Grabowiec, Lublin - Russia | |
| Oleszko | Rzeszow - Galicia | ties, 1880-1900 |
| Olewicz | Krakow - Galicia | parish: St. Szczepan |
| Olewinski | Lubstowek, Konin - Russia | |
| Olewinski | Slupca, Konin - Russia | |
| Olewinski | Wegrzynowo, Ciechanow - Russia | |
| Olewinski | Zaduszniki, Torun - Russia | |
| Olewnicki | Karnkowo - Russia | |
| Olewniczak | Zbikow - Warsaw | |
| Olewnik | Plock - Russia | Marriages, 1850-1880, parish: Duninow |
| Olexiejko | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Olexiewicz | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Olexieyczyk | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Olexyk | Trzebieszow - Russia | parish: Trzebieszow |
| Oleyniczak | Czeszewo, Wrzesnia - Prussia | |
| Oleyniczak | Dziekanowice, Gniezno - Prussia | |
| Oleyniczak | Szadek - Russia | |
| Oleyniczak | Zadzim - Russia | |
| Oleynik | Lubasz - Prussia | |
| Oleziuk | Dziurow, Sniatyn - Galicia | |
| Olfier | Janowka, Augustow - Russia | 1880-1890 |
| Olfier | Raczki, Augustow - Russia | cemetery |
| Olgrzymek | Mogilno, Posen - Prussia | cemetery |
| Oli | Lodz, Piotrkow - Russia | |
| Olichwier | Jaminy, Augustow - Russia | marriages, 1800-1868 |
| Olichwier | Sztabin, Augustow - Russia | |
| Olicki | Kalinowka Koscielna, Bialystok - Russia | 1760-1780 |
| Oliniak | Zaslanie - Galicia | |
| Olinkiewicz | Stary Skalat - Galicia | |
| Olinski | Golancz - Prussia | |
| Olinski | Ojrzanow - Warsaw | |
| Olinski | Tur, Lodz - Russia | |
| Oliszowski | Ludwikowka, Mikulince - Galicia | |
| Oliwa | Nosowka - Galicia | |
| Oliwiak | Czulczyce, Chelm, Lublin - Russia | |
| Oliwkowski | Radziwie, Plock - Russia | |
| Oliwny | Prawno, Lublin - Russia | |
| Olizarowicz | Wilno - Russia (now Lithuania) | |
| Olkiewicz | Kurowo - Russia | |
| Olkiewicz | Skulsk - Russia | |
| Olkiewicz | Torun - Prussia | civic records, 1876-1888 |
| Olkiewicz | Wilno - Russia (now Lithuania) | 1742-1747 |
| Olko | Jezowe, Nisko - Galicia | |
| Olko | Kamien, Gorno - Galicia | |
| Olko | Obrzycko - Prussia | |
| Olkowicz | Jamno - Russia | |
| Olkowicz | Knyszyn, Podlasie - Russia | 1740-1770 |
| Olkowski | Bielczyny (Bildschon), Torun - Prussia | |
| Olkowski | Chelmza (Culmsee) - Prussia | |
| Olkowski | Karniewo - Russia | |
| Olkowski | Kleczew, Konin - Russia | |
| Olkowski | Przasnysz - Russia | |
| Olkowski | Stare Miasto, Konin - Russia | |
| Olkusz | Tarnobrzeg - Galicia | census, 1880 |
| Oller | Paczewo, Swiecie - Prussia | cemetary |
| Olomucki | Lodz - Russia | jewish, 1920-1925 |
| Oloniejowicz | Jasionowka, Podlasie - Russia | 1764-1799 |
| Olos | Sarnowo Zurominskie, Plock - Prussia | |
| Olow | Augustow - Russia | Augustow county notary records, 1808-1830 |
| Olow | Jeleniewo - Russia | |
| Olow | Zielona - Russia | |
| Olowinik | Kuczbork, Plock - Prussia | |
| Olpinski | Biecz - Galicia | |
| Olpinski | Rzeszow - Galicia | ties, 1880-1900 |
| Olran | Zubow, Trembowla - Galicia | |
| Olski | Drzycim - Prussia | cemetary |
| Olsniewicz | Jaslo - Galicia | |
| Olszacki | Malyn - Russia | |
| Olszak | Kleczew, Konin - Russia | |
| Olszak | Mogilno, Posen - Prussia | cemetery |
| Olszak | Ojrzanow - Warsaw | |
| Olszak | Ostrowo Mogilskie - Prussia | diocese: Gniezno |
| Olszak | Stare Miasto, Konin - Russia | |
| Olszak | Wojcin, Strzelno - Prussia | |
| Olszakiewicz | Kleczew, Konin - Russia | |
| Olszanski | Glogowiec, Lodz - Russia | |
| Olszanski | Krzywcza, Przemysl - Galicia | |
| Olszany | Widelka - Galicia | |
| Olszer | Lodz, Piotrkow - Russia | |
| Olszewik | Dlugosiodlo, Ostrow - Russia | |
| Olszewski | Augustow - Russia | notary records: contracts, inheritances, purchases and sales, 1830-1835 |
| Olszewski | Bernadowka, Trembowla - Galicia | |
| Olszewski | Bielczyny (Bildschon), Torun - Prussia | |
| Olszewski | Bogurzyn, Malta - Russia | 1885-1886 |
| Olszewski | Bogurzyn, Mlawa - Russia | 1870-1890 |
| Olszewski | Czarne, Lipno - Russia | |
| Olszewski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Olszewski | Dzierzgowo, Przasnysz - Russia | |
| Olszewski | Filipow, Augustow - Russia | cemetery |
| Olszewski | Gradzanowo, Sierpc - Russia | Catholic |
| Olszewski | Jaminy - Russia | |
| Olszewski | Jaminy, Augustow - Russia | marriages, 1800-1868 |
| Olszewski | Janowka, Augustow - Russia | 1880-1890 |
| Olszewski | Jezno - Russia (Lithuania) | 1787-1883 |
| Olszewski | Jezno, Kowno (Kaunas) - Russia | |
| Olszewski | Kaletnik - Russia | |
| Olszewski | Kamionka Mala - Galicia | |
| Olszewski | Kiejdany, Lithuania - Russia | 1755-1763 |
| Olszewski | Kilo, Lipno - Russia | |
| Olszewski | Knyszyn, Podlasie - Russia | 1740-1770 |
| Olszewski | Komarow - Russia | |
| Olszewski | Kozakiski, Troki - Russia (now Lithuania) | 1841, parish: Kozakiski |
| Olszewski | Krakow - Galicia | parish: St. Szczepan |
| Olszewski | Krasnybor - Russia | |
| Olszewski | Kroze (Kraziai), Lithuania - Russia | |
| Olszewski | Kurowo - Russia | |
| Olszewski | Leczyca, Lodz - Russia | based on civil records, 1821 |
| Olszewski | Lysakowo, Przasnysz - Russia | |
| Olszewski | Miroslawiec - Russia (now Lithuania) | parish: Miroslawiec |
| Olszewski | Mlawa - Russia | Evangelic |
| Olszewski | Mogilno, Posen - Prussia | cemetery |
| Olszewski | Mokre, Grudziadz - Prussia | |
| Olszewski | Nienokszty (Nemeksciu) - Lithuania (Russia) | 1783-1870 |
| Olszewski | Nosowka - Galicia | |
| Olszewski | Ojrzanow - Warsaw | |
| Olszewski | Ostroda - Prussia | |
| Olszewski | Perlejewo - Russia | |
| Olszewski | Polkowo, Goniadz - Russia | |
| Olszewski | Przerosl - Russia | |
| Olszewski | Punsk - Russia | |
| Olszewski | Raczki, Augustow - Russia | cemetery |
| Olszewski | Radzyn, Plock - Prussia | |
| Olszewski | Rajgrod, Suwalki - Russia | |
| Olszewski | Rogowo - Russia | |
| Olszewski | Sereje - Russia (now Lithuania) | |
| Olszewski | Sereje - Russia | |
| Olszewski | Sztabin, Augustow - Russia | |
| Olszewski | Topczewo, Bialystok - Russia | cemetary |
| Olszewski | Troki Town - Russia / Lithuania | 1908 |
| Olszewski | Tykocin - Russia | 1890-1905 |
| Olszewski | Znin - Prussia | |
| Olszowski | Kamienna Gora - Galicia | parish: Przeczyce |
| Olszowski | Krakow - Galicia | parish: St. Szczepan |
| Olszowski | Prawno, Lublin - Russia | |
| Olszowski | Wilczyn, Konin - Russia | |
| Olszowski | Wola Pawlowska - Russia | |
| Olszowy | Jezowe, Nisko - Galicia | |
| Olszowy | Przechowo - Prussia | cemetery |
| Olszta | Gradzanowo, Sierpc - Russia | Catholic |
| Olszta | Radzyn, Plock - Prussia | |
| Olsztyn | Kaletnik - Russia | |
| Olsztyn | Sejny - Russia (now Lithuania) | |
| Olsztyn | Sejny - Russia | |
| Olsztyn | Wilno - Russia (now Lithuania) | 1742-1747 |
| Olszycki | Lodz - Russia | jewish, 1920-1925 |
| Olszynski | Ojrzanow - Warsaw | |
| Olszynski | Sarnowo - Russia | |
| Oltarzeski | Spicimierz - Russia | |
| Oltarzeski | Uniejow - Russia | |
| Oltarzewski | Chelm, Lublin - Russia | |
| Oltolski | Mokre, Grudziadz - Prussia | |
| Olumnik | Jeleniewo - Russia | |
| Olynski | Wilno - Russia (now Lithuania) | |
| Olzog | Breslau - Prussia | |
| Olzynski | Zielona (by Zuromin), Mlawa - Prussia | |
| Omanowski | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Omanowski | Jaminy - Russia | |
| Omanowski | Jaminy, Augustow - Russia | marriages, 1800-1868 |
| Omanowski | Polkowo, Goniadz - Russia | |
| Omasta | Tresna, Zywiec - Galicia | |
| Omelanczyk | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Omelian | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Omeljak | Lipnica Wielka, Orawa - Galicia | |
| Omelski | Goniadz and area - Russia | 1677 |
| Omelski | Goniadz, Grodzkie - Polish Kingdom | Lukasz, 1678-1679, diocese: Vilno |
| Omelski | Knyszyn, Podlasie - Russia | 1740-1770 |
| Omiecinski | Tarnowica Polna, Ottynia - Galicia | |
| Omiecinski | Wolborz - Russia | military station was there |
| Omieciuch | Rabka, Nowy Targ - Galicia | old cemetary |
| Omilak | Lipnica Wielka, Orawa - Galicia | |
| Omilewicz | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Omilewicz | Lozdzieje, Grodno - Russia (now Lithuania) | |
| Omilian | Bakalarzewo - Russia | |
| Omilian | Bakalarzewo, Augustow - Russia | cemetery |
| Omilian | Jaminy, Augustow - Russia | marriages, 1800-1868 |
| Omilian | Janowka, Augustow - Russia | 1880-1890 |
| Omilianowicz | Filipow, Augustow - Russia | cemetery |
| Omilianowicz | Lipsk, Augustow - Russia | cemetery |
| Omilowicz | Wilno - Russia (now Lithuania) | 1742-1747 |
| Ominski | Gora, Znin - Prussia | |
| Omonkowski | Wolborz - Russia | military station was there |
| Ompel | Kutno - Russia | |
| Onak | Skrzyszow, Tarnow - Galicia | |
| Onarewicz | Merecz (Merkine) - Russia (now Lithuania) | |
| Onczyk | Suszerz - Russia | |
| Ondraka | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Ondruczek | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Ondurka | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Ongirski | Wilno - Russia (now Lithuania) | |
| Onich | Sereje - Russia (now Lithuania) | |
| Onich | Sereje - Russia | |
| Onicz | Jaslo - Galicia | |
| Onik | Skrzyszow, Tarnow - Galicia | |
| Oninski | Gebice - Prussia | |
| Onisczyk | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Onisko | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Oniszkowski | Topczewo, Bialystok - Russia | cemetary |
| Onopa | Topczewo, Bialystok - Russia | cemetary |
| Onopiuk | Rajsk, Bialystok - Russia | |
| Onorewicz | Merecz (Merkine) - Russia (now Lithuania) | |
| Onorewicz | Mokniuny, Merecz - Russia (now Lithuania) | 1700s |
| Onuferko | Tarnopol - Galicia | |
| Onufrowicz | Kaletnik - Russia | |
| Onulewicz | Jezno, Kowno (Kaunas) - Russia | |
| Onuszaniec | Wola Nizna - Galicia | |
| Onuszaniec | Wola Wyzna - Galicia | |
| Onuszczak | Czulczyce, Chelm, Lublin - Russia | |
| Onuszczak | Grab - Galicia | |
| Onuszczak | Ozenna - Galicia | |
| Onuszczak | Wyszowatka - Galicia | |
| Onysyk | Starzawa, Mosciska - Galicia | |
| Onyszkiewicz | Dabrowa Bialostocka, Podlasie - Russia | 1720-1735 |
| Onyszkiewicz | Jaslo - Galicia | |
| Onyszkiewicz | Melgiew, Lublin - Russia | |
| Onyszkiewicz | Uchanie, Lublin - Russia | |
| Onyszkow | Janow Trembowelski, Trembowla - Galicia | |
| Opacian | Ratulow - Galicia | parish: Czarny Dunajec |
| Opacion | Ratulow - Galicia | parish: Czarny Dunajec |
| Opacki | Goniadz and area - Russia | 1677 |
| Opacki | Krakow - Galicia | parish: St. Szczepan |
| Opacki | Wilno - Russia (now Lithuania) | |
| Opala | Jaslo - Galicia | |
| Opalak | Grab - Galicia | |
| Opalak | Ozenna - Galicia | |
| Opalak | Wyszowatka - Galicia | |
| Opalewski | Znin - Prussia | |
| Opalinski | Budzislaw, Konin - Russia | |
| Opalinski | Dzierzgowo, Przasnysz - Russia | |
| Opalinski | Krasnopol - Russia | |
| Opalinski | Nosowka - Galicia | |
| Opalinski | Rajsk, Bialystok - Russia | |
| Opalinski | Rzeszow - Galicia | ties, 1880-1900 |
| Opalinski | Sejny - Russia (now Lithuania) | |
| Opalinski | Sejny - Russia | |
| Opalinski | Wasewo - Russia | |
| Opalka | Bachorzec - Galicia | |
| Opalka | Krzywcza, Przemysl - Galicia | |
| Opalka | Niepla - Galicia | parish: Szebnie |
| Opalko | Wegierka - Galicia | |
| Opalony | Milowka - Galicia | |
| Opalony | Rajcza - Galicia | |
| Opalski | Krakow - Galicia | parish: St. Szczepan |
| Opanowicz | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Opanowicz | Lozdzieje, Grodno - Russia (now Lithuania) | |
| Opanowicz | Wilno - Russia (now Lithuania) | |
| Opanowski | Rajgrod, Suwalki - Russia | |
| Opara | Prawno, Lublin - Russia | |
| Oparka | Przechowo - Prussia | cemetery |
| Oparski | Bartodzieje Male (Klein Bartelsee), Bydgoszcz (Bromberg) - Prussia | |
| Opartowski | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Oparuk | Zawale, Sniatyn - Galicia | |
| Opasiak | Krosniewice, Lodz - Russia | |
| Opat | Widelka - Galicia | |
| Opatowski | Lodz, Piotrkow - Russia | |
| Opatowski | Zdunska Wola, Lodz - Russia | jews, 1820-1850 |
| Opechowski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Openchowski | Radziwie, Plock - Russia | |
| Openhaim | Lodz - Russia | jewish, 1920-1925 |
| Operacz | Broniszewo, Konin - Russia | |
| Operacz | Goslawice, Konin - Russia | |
| Opertowski | Osie, Swiecie - Prussia | cemetary |
| Opicz | Iwanowice, Kalisz - Russia | 1790-1820 |
| Opidowicz | Krakow - Galicia | parish: St. Szczepan |
| Opidowicz | Ponice, Rabka - Galicia | |
| Opiela | Sedziszow Malopolski - Galicia | |
| Opielski | Golina, Konin - Russia | |
| Opielski | Mlodojewo, Konin - Russia | |
| Opila | Rabka, Nowy Targ - Galicia | old cemetary |
| Opiola | Slopnice - Galicia | |
| Opiola | Tarnowiec, Jaslo - Galicia | cemetary |
| Opiola | Wojnicz - Galicia | |
| Opis | Lask, Lodz - Russia | |
| Opitz | Jelenia Gora - Prussia | Hirschberg |
| Opitz | Legnica - Prussia | Liegnitz |
| Oplatek | Peczniew - Russia | |
| Oplatkowski | Drzycim - Prussia | cemetary |
| Oplinski | Melgiew, Lublin - Russia | |
| Opoczka | Krakow - Galicia | parish: St. Szczepan |
| Opoczynski | Wloclawek - Russia | |
| Opojewicz | Szadek - Russia | |
| Opolinski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Opolka | Breslau - Prussia | |
| Opolka | Legnica - Prussia | Liegnitz |
| Opolski | Bielsk, Plock - Russia | |
| Opolski | Krakow - Galicia | parish: St. Szczepan |
| Opolski | Ostrow Mazowiecka - Russia | |
| Opolski | Peczniew - Russia | |
| Opolski | Rzeszow - Galicia | ties, 1880-1900 |
| Oponowicz | Dabrowa Bialostocka, Podlasie - Russia | 1720-1735 |
| Oponowicz | Tykocin - Russia | 1890-1905 |
| Oporek | Opole Lubelskie, Lublin - Russia | |
| Oposka | Obra, Wolsztyn - Prussia | |
| Opotowski | Zdunska Wola, Lodz - Russia | |
| Oppel | Zdunska Wola, Lodz - Russia | |
| Oppitz | Jelenia Gora - Prussia | Hirschberg |
| Oprawa | Zaborowo - Prussia | diocese: Torun |
| Oprych | Krakow - Galicia | parish: St. Szczepan |
| Opryszka | Wislok - Galicia | |
| Opst | Komarow - Russia | |
| Opuszko | Topczewo, Bialystok - Russia | cemetary |
| Opychowski | Knyszyn, Podlasie - Russia | 1740-1770 |
| Oracki | Cieleta - Prussia | diocese: Torun |
| Oracki | Szczuka, Torun - Prussia | diocese: Torun |
| Oracz | Janowka, Augustow - Russia | 1880-1890 |
| Oraczewski | Krakow - Galicia | parish: St. Szczepan |
| Oraczewski | Przedecz - Russia | |
| Oraczewski | Wola Zglobienska, Zglobien - Galicia | |
| Oraczynski | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Orankiewicz | Mokowo, Plock - Russia | |
| Orankiewicz | Zaduszniki, Torun - Russia | |
| Oranski | Znin - Prussia | |
| Oraszkiewicz | Przerosl - Russia | |
| Oraszko | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Orawiec | Miedzybrodzie, Zywiec - Galicia | |
| Orawiec | Rajcza - Galicia | |
| Orba | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Orba | Jadeszki - Polish Kingdom | 1700s, parish: Dolistowo |
| Orba | Lubieszow, Pinsk - Russia | |
| Orbach | Lodz, Piotrkow - Russia | |
| Orbach | Zdunska Wola, Lodz - Russia | jews, 1820-1850 |
| Orbaczewski | Badkowo Koscielne, Plock - Russia | |
| Orbaczewski | Karnkowo - Russia | |
| Orbaczewski | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Orbaczewski | Lozdzieje, Grodno - Russia (now Lithuania) | |
| Orbaczewski | Plock - Russia | Marriages, 1850-1880, parish: Duninow |
| Orbaszewski | Kaletnik - Russia | |
| Orbatowicz | Wilno - Russia (now Lithuania) | 1742-1747 |
| Orbic | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Orbic | Jadeszki - Polish Kingdom | 1600s, parish: Dolistowo |
| Orbik | Barglow - Russia | |
| Orbik | Jadeszki - Polish Kingdom | 1600s, parish: Dolistowo |
| Orbik | Krasnopol - Russia | |
| Orbik | Krasnybor - Russia | |
| Orbik | Netta - Russia | |
| Orbik | Pruska Wielka - Russia | |
| Orbik | Tajenko - Russia | |
| Orbik | Tajno - Russia | |
| Orbo | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Orbowski | Gadonow (Gadunavo), Kowno (Kaunas) - Russia | 1830-1845 |
| Orbyk | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Orbyniak | Debe, Kalisz - Russia | |
| Orchic | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Orcholski | Wrzesnia - Prussia | |
| Orchowski | Ladek, Konin - Russia | |
| Orchowski | Osie, Swiecie - Prussia | cemetary |
| Orcianik | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Orcikowski | Fordon, Bydgoszcz (Bromberg) - Prussia | |
| Orczyk | Stare Miasto, Konin - Russia | |
| Orczyk | Zbikow - Warsaw | |
| Orczykowski | Lowicz - Russia | Roman Catholic |
| Orczykowski | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Orczykowski | Pleszew, Poznan - Prussia | |
| Orczykowski | Torun - Prussia | civic records, 1876-1888 |
| Orczykowski | Zagurow (now Zagorow), Konin - Russia | |
| Orczykwoski | Krakow - Galicia | parish: St. Szczepan |
| Ordakowski | Baboszewo, Plonsk, Warsaw - Russia | |
| Ordanski | Kilo, Lipno - Russia | |
| Ordega | Blaszki, Konin - Russia | |
| Ordiczuk | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Ordis | Lipnica Wielka, Orawa - Galicia | |
| Ordon | Blaszki, Konin - Russia | |
| Ordon | Kilo, Lipno - Russia | |
| Ordon | Stale, Wielowies - Galicia | |
| Ordon | Tarnobrzeg - Galicia | census, 1880 |
| Ordon | Zagurow (now Zagorow), Konin - Russia | |
| Ordowski | Janowka, Augustow - Russia | 1880-1890 |
| Ordowski | Szczebra, Augustow - Russia | cemetery |
| Ordyk | Dzikow, Tarnobrzeg - Galicia | |
| Ordynans | Konstantynow, Lodz - Russia | books of residence, 1890-1930 |
| Ordynans | Lodz, Piotrkow - Russia | |
| Ordyniak | Debe, Kalisz - Russia | |
| Ordyniec | Zawada - Russia | |
| Ordzik | Jadeszki - Polish Kingdom | 1600s, parish: Dolistowo |
| Orelecki | Zawale, Sniatyn - Galicia | |
| Orelowicz | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Orelowicz | Lozdzieje, Grodno - Russia (now Lithuania) | |
| Oreluk | Krasnybor, Augustow - Russia | cemetery |
| Orenbuch | Lodz, Piotrkow - Russia | |
| Orenkiewicz | Badkowo Koscielne, Plock - Russia | |
| Orent | Sierpc, Mazovia - Russia | Evangelics |
| Orent | Zale, Plock - Russia | |
| Orenycz | Krempna - Galicia | |
| Oresko | Remigola (Ramygala), Kiejdany - Russia (now Lithuania) | 1779-1796 |
| Orezewicz | Tur, Lodz - Russia | |
| Orgalisz | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Organek | Baboszewo, Plonsk, Warsaw - Russia | |
| Organek | Bialaszewo, Lomza - Russia | |
| Organisciak | Kramsk, Konin - Russia | |
| Organista | Grabowiec, Lublin - Russia | |
| Organista | Nosowka - Galicia | |
| Organista | Tajno - Russia | |
| Organisziak | Widelka - Galicia | |
| Organowski | Bogate, Ciechanow - Russia | |
| Organowski | Tykocin - Russia | 1890-1905 |
| Orgas | Torun - Prussia | civic records, 1876-1888 |
| Orik | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Orinski | Remigola (Ramygala), Kiejdany - Russia (now Lithuania) | 1779-1796 |
| Orisz | Liskiava (Liszkow) - Russia (now Lithuania) | |
| Orisz | Liszkow - Russia (now Lithuania) | |
| Oriwol | Breslau - Prussia | |
| Orkerzewski | Bielczyny (Bildschon), Torun - Prussia | |
| Orkiszewski | Bielczyny (Bildschon), Torun - Prussia | |
| Orkiszewski | Grabowiec, Lublin - Russia | |
| Orkiszewski | Sarnowo Zurominskie, Plock - Prussia | |
| Orkowicz | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Orkowicz | Lozdzieje, Grodno - Russia (now Lithuania) | |
| Orkusz | Janow Trembowelski, Trembowla - Galicia | |
| Orkwiszewski | Radzaniow, Plock - Prussia | |
| Orkwiszewski | Zielona (by Zuromin), Mlawa - Prussia | |
| Orlan | Turowiec, Lublin - Russia | |
| Orlan | Uchanie, Lublin - Russia | |
| Orlanski | Ludwikowka, Mikulince - Galicia | |
| Orlean | Krasnystaw - Russia | |
| Orleff | Olpiny - Galicia | |
| Orlenski | Mokowo, Plock - Russia | |
| Orliak | Wilno - Russia (now Lithuania) | |
| Orlicki | Krakow - Galicia | parish: St. Szczepan |
| Orlik | Strzelno - Prussia | |
| Orlik | Zychlin, Lodz - Russia | 1850-1870 |
| Orlikowski | Baboszewo, Plonsk, Warsaw - Russia | |
| Orlikowski | Kowal - Russia | |
| Orlikowski | Ladek, Konin - Russia | |
| Orlikowski | Niedrzwica Koscielna, Lublin - Russia | |
| Orlinski | Kurowo - Russia | |
| Orlinski | Merecz (Merkine) - Russia (now Lithuania) | |
| Orloff | Olpiny - Galicia | |
| Orloski | Bolimow, Lodz - Russia | |
| Orlowski | Bartodzieje Male (Klein Bartelsee), Bydgoszcz (Bromberg) - Prussia | |
| Orlowski | Bielczyny (Bildschon), Torun - Prussia | |
| Orlowski | Blaszki, Konin - Russia | |
| Orlowski | Borszewice, Szadek - Russia | |
| Orlowski | Brzezany - Galicia | |
| Orlowski | Chamsk, Plock - Prussia | |
| Orlowski | Dlugosiodlo, Ostrow - Russia | |
| Orlowski | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Orlowski | Dubszcze, Brzezany - Galicia | |
| Orlowski | Dzierzgowo, Przasnysz - Russia | |
| Orlowski | Gebice - Prussia | |
| Orlowski | Gostyn - Prussia | 1864-1874 |
| Orlowski | Jaminy, Augustow - Russia | marriages, 1800-1868 |
| orlowski | Jaryczow, Lwow - Galicia | |
| Orlowski | Jaslo - Galicia | |
| Orlowski | Jewienski, Troki - Russia (now Lithuania) | 1841, parish: Jewienski |
| Orlowski | Kazimierz Biskupi, Konin - Russia | |
| Orlowski | Knychowek, Drohiczyn - Russia | 1755-1790 |
| Orlowski | Knyszyn, Podlasie - Russia | 1740-1770 |
| Orlowski | Kozakiski, Troki - Russia (now Lithuania) | 1841, parish: Kozakiski |
| Orlowski | Krasnopol - Russia | |
| Orlowski | Krosniewice, Lodz - Russia | |
| Orlowski | Krzywcza, Przemysl - Galicia | |
| Orlowski | Leczyca, Lodz - Russia | based on civil records, 1821 |
| Orlowski | Lipsk, Augustow - Russia | cemetery |
| Orlowski | Lodz - Russia | |
| Orlowski | Malyn - Russia | |
| Orlowski | Mokre, Grudziadz - Prussia | |
| Orlowski | Osiek Wielki - Russia | |
| Orlowski | Ostrow Mazowiecka - Russia | |
| Orlowski | Piaski, Lublin - Russia | |
| Orlowski | Polupanowka, Skalat - Galicia | |
| Orlowski | Poniemon (Aukstosios) - Russia Lithuania | 1820-1830 |
| Orlowski | Przasnysz - Russia | |
| Orlowski | Rajgrod, Suwalki - Russia | |
| Orlowski | Rotnica (Ratnica), Troki - Russia (now Lithuania) | |
| Orlowski | Sorokpol, Vilno - Russia (now Lithuania) | 1909 |
| Orlowski | Stale, Wielowies - Galicia | |
| Orlowski | Strzelno - Prussia | |
| Orlowski | Szadek - Russia | |
| Orlowski | Torun - Prussia | civic records, 1876-1888 |
| Orlowski | Trebki, Plock - Russia | |
| Orlowski | Tykocin - Russia | 1890-1905 |
| Orlowski | Wilno - Russia (now Lithuania) | |
| Orlowski | Wizajny - Russia (now Lithuania) | |
| Orlowski | Wloclawek - Russia | 1855 |
| Orlowski | Wojslawice, Lublin - Russia | |
| Orlowski | Zaklikow - Russia | |
| Orlowski | Zale, Plock - Russia | |
| Orlowski | Zielona (by Zuromin), Mlawa - Prussia | |
| Orlozynski | Augustow - Russia | notary records: contracts, inheritances, purchases and sales, 1830-1835 |
| Ormanowski | Berzniki - Russia (now Lithuania) | |
| Ornacki | Gebice - Prussia | |
| Ornacki | Jasienica - Russia | |
| Ornal | Fajslawice, Lublin - Russia | |
| Ornalik | Debowiec, Jaslo - Galicia | 1746-1774 |
| Ornat | Grabowiec, Lublin - Russia | |
| Ornatek | Mogilno, Posen - Prussia | cemetery |
| Ornatek | Strzelno - Prussia | |
| Ornatkiewicz | Wilno - Russia (now Lithuania) | 1742-1747 |
| Oroszki | Jadeszki - Polish Kingdom | 1600s, parish: Dolistowo |
| Oroszko | Barglow - Russia | |
| Oroszko | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Oroszko | Janowka, Augustow - Russia | 1880-1890 |
| Orowicz | Chelm, Lublin - Russia | |
| Orowicz | Sereje - Russia (now Lithuania) | |
| Orowicz | Sereje - Russia | |
| Orpel | Kozmin, Poznan - Prussia | |
| Orpel | Topola Mala, Ostrow Wlk - Prussia | |
| Orpel | Walkow, Kozmin - Prussia | |
| Orpik | Dabrowa Bialostocka, Podlasie - Russia | 1720-1735 |
| Orpik | Kamienna, Dabrowa Bialostocka Podlasie - Russia | 1730-1745 |
| Orpik | Lipsk, Augustow - Russia | cemetery |
| Orpik | Nierosne, Dabrowa Bialostocka Podlasie - Russia | 1730-1745 |
| Orpikowski | Kramsk, Konin - Russia | |
| Orpikowski | Lubstowek, Konin - Russia | |
| Orsetti | Leczyca, Lodz - Russia | based on civil records, 1821 |
| Orsichowski | Chelmza (Culmsee) - Prussia | |
| Orszak | Jablonica Polska - Galicia | |
| Orszak | Kamien, Gorno - Galicia | |
| Orszak | Myscowa - Galicia | |
| Orszetty | Goniadz and area - Russia | 1677 |
| Orszewski | Nienokszty (Nemeksciu) - Lithuania (Russia) | 1783-1870 |
| Orsztynowicz | Ostrow Wlk - Prussia | |
| Orsztynowicz | Skalmierzyce, Ostrow Wlk - Prussia | |
| Orszulak | Bielcza - Galicia | diocese: Tarnow |
| Orszulak | Peczniew - Russia | |
| Ortmann | Pyrzyce (Pyritz) - Prussia | |
| Ortus | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Ortyl | Majdan Krolewski, Nisko - Russia | |
| Orwat | Obra, Wolsztyn - Prussia | |
| Orwat | Rzeszow - Galicia | ties, 1880-1900 |
| Orwat | Szczucin - Galicia | |
| Oryelczyk | Kozmin, Poznan - Prussia | |
| Oryl | Chamsk, Plock - Prussia | |
| Oryl | Zielona (by Zuromin), Mlawa - Prussia | |
| Orynycz | Grab - Galicia | |
| Orynycz | Ozenna - Galicia | |
| Orynycz | Wyszowatka - Galicia | |
| Oryplis | Remigola (Ramygala), Kiejdany - Russia (now Lithuania) | 1779-1796 |
| Oryszczak | Pielgrzymka - Galicia | |
| Oryszczak | Slopnice - Galicia | |
| Oryszczak | Tarnobrzeg - Galicia | census, 1880 |
| Oryszewski | Zbikow - Warsaw | |
| Orywa | Odolanow, Poznan - Prussia | |
| Orywald | Raszkow, Ostrow Wlkp - Prussia | |
| Orzazewski | Wloclawek - Russia | 1750-1800 |
| Orzdynski | Skalmierzyce, Ostrow Wlk - Prussia | |
| Orzech | Nosowka - Galicia | |
| Orzech | Prawno, Lublin - Russia | |
| Orzech | Widelka - Galicia | |
| Orzechowicz | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Orzechowicz | Iwanowice, Kalisz - Russia | 1790-1820 |
| Orzechowicz | Jaryczow, Lwow - Galicia | |
| Orzechowski | Berzniki - Russia (now Lithuania) | |
| Orzechowski | Bialaszewo, Lomza - Russia | |
| Orzechowski | Boby, Lublin - Russia | |
| Orzechowski | Czestoborowice - Russia | |
| Orzechowski | Czeszewo, Wrzesnia - Prussia | |
| Orzechowski | Debowiec, Jaslo - Galicia | 1746-1774 |
| Orzechowski | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Orzechowski | Glogowiec, Lodz - Russia | |
| Orzechowski | Gradzanowo, Sierpc - Russia | Catholic |
| Orzechowski | Iwanowka, Trembowla - Galicia | |
| Orzechowski | Jaslo - Galicia | |
| Orzechowski | Kiejdany, Lithuania - Russia | 1755-1763 |
| Orzechowski | Kilo, Lipno - Russia | |
| Orzechowski | Krakow - Galicia | parish: St. Szczepan |
| Orzechowski | Krasne, Rzeszow - Galicia | |
| Orzechowski | Krasnopol - Russia | |
| Orzechowski | Krzywcza, Przemysl - Galicia | |
| Orzechowski | Kurowo - Russia | |
| Orzechowski | Kutno - Russia | |
| Orzechowski | Leczyca, Lodz - Russia | based on civil records, 1821 |
| Orzechowski | Mogilno - Prussia | |
| Orzechowski | Mokre, Grudziadz - Prussia | |
| Orzechowski | Nosowka - Galicia | |
| Orzechowski | Ostrow Mazowiecka - Russia | |
| Orzechowski | Rajgrod, Suwalki - Russia | |
| Orzechowski | Strzelno - Prussia | |
| Orzechowski | Suszerz - Russia | |
| Orzechowski | Trebki, Plock - Russia | |
| Orzechowski | Trzebieszow - Russia | parish: Trzebieszow |
| Orzechowski | Tykocin - Russia | 1890-1905 |
| Orzechowski | Wasewo - Russia | |
| Orzechowski | Wierzchoslawice - Galicia | |
| Orzechowski | Wilno - Russia (now Lithuania) | |
| Orzechowski | Zarzecze, Jaslo - Galicia | |
| Orzechowski | Zielona (by Zuromin), Mlawa - Prussia | |
| Orzechowski | Zychlin, Lodz - Russia | 1850-1870 |
| Orzedowski | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Orzedowski | Lozdzieje, Grodno - Russia (now Lithuania) | |
| Orzegowski | Lodz, Piotrkow - Russia | |
| Orzel | Bielcza - Galicia | diocese: Tarnow |
| Orzel | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Orzel | Kamionka Mala - Galicia | |
| Orzelski | Kalinowka Koscielna, Bialystok - Russia | 1760-1780 |
| Orzelski | Wasosze, Konin - Russia | |
| Orzenek | Jamno - Russia | |
| Orzepowski | Tolwin - Russia | |
| Orzesko | Remigola (Ramygala), Kiejdany - Russia (now Lithuania) | 1779-1796 |
| Orzeszek | Bielcza - Galicia | diocese: Tarnow |
| Orzeszko | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Orzol | Obra, Wolsztyn - Prussia | |
| Orzulak | Szczucin - Galicia | |
| Osada | Budzislaw, Konin - Russia | |
| Osada | Dobroslowo, Konin - Russia | |
| Osada | Pruchnik - Galicia | |
| Osadcow | Ottynia - Galicia | |
| Osadcza | Hnilice - Galicia | |
| Osadczuk | Toki - Galicia | |
| Osadczuk | Trembowla - Galicia | |
| Osak | Nagoszyn, Debica - Galicia | cemetary |
| Oschinski | Bartodzieje Male (Klein Bartelsee), Bydgoszcz (Bromberg) - Prussia | |
| Oschinski | Chelmza (Culmsee) - Prussia | |
| Oscik | Kutno - Russia | |
| Oscinski | Wloclawek - Russia | 1855 |
| Osekowski | Sanok - Galicia | |
| Osendowski | Plock - Russia | Marriages, 1850-1880, parish: Duninow |
| Oseniak | Uscie Ruskie (now Gorlickie) - Galicia | Uscie Ruskie is now Gorlickie |
| Osenkowski | Czaszyn - Galicia | |
| Osep | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Osepowicz | Wilno - Russia (now Lithuania) | 1742-1747 |
| Oserowicz | Augustow - Russia | Augustow county notary records, 1808-1830 |
| Osetek | Konstantynow, Lodz - Russia | books of residence, 1890-1930 |
| Osewski | Filipow, Augustow - Russia | cemetery |
| Osiaczyk | Iwanowice, Kalisz - Russia | 1790-1820 |
| Osiadacz | Nowosielce, Mosciska - Galicia | |
| Osiadacz | Tarczyn - Warsaw | |
| Osiadly | Drohobyczka, Przemysl - Galicia | |
| Osiak | Lodz, Piotrkow - Russia | |
| Osicki | Kowal - Russia | |
| Osicki | Osie, Swiecie - Prussia | cemetary |
| Osiczak | Dzierzbice - Russia | |
| Osida | Gorzkow, Lublin - Russia | |
| Osiecha | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Osiecki | Augustow - Russia | Augustow county notary records, 1808-1830 |
| Osiecki | Brok - Russia | |
| Osiecki | Brzezany - Galicia | |
| Osiecki | Chelm, Lublin - Russia | |
| Osiecki | Dubszcze, Brzezany - Galicia | |
| Osiecki | Gojsk, Sierpc - Russia | |
| Osiecki | Gradzanowo, Sierpc - Russia | Catholic |
| Osiecki | Kaletnik - Russia | |
| Osiecki | Knychowek, Drohiczyn - Russia | 1755-1790 |
| Osiecki | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Osiecki | Kurowo - Russia | |
| Osiecki | Lysakowo, Przasnysz - Russia | |
| Osiecki | Nowa Olszewnica - Russia | |
| Osiecki | Nowy Dwor, Lida - Russia (now Lithuania) | |
| Osiecki | Sierpc, Mazovia - Russia | Evangelics |
| Osiecki | Sztabin, Augustow - Russia | |
| Osieczak | Skalmierzyce, Ostrow Wlk - Prussia | |
| Osieglowski | Gostyn - Prussia | 1864-1874 |
| Osielski | Kalinowka Koscielna, Bialystok - Russia | 1760-1780 |
| Osieniecki | Pakosc - Prussia | |
| Osienski | Kilo, Lipno - Russia | |
| Osiewala | Ostrow Wlk - Prussia | |
| Osiewicz | Dzierzbice - Russia | |
| Osiewski | Mogilno, Posen - Prussia | cemetery |
| Osiewski | Tajno - Russia | |
| Osik | Melgiew, Lublin - Russia | |
| Osika | Debowiec, Jaslo - Galicia | 1746-1774 |
| Osika | Glinik Polski, Jaslo - Galicia | baptisms, 1878-1935 |
| Osika | Lukanowice, Tarnow - Galicia | |
| Osika | Skrzynka - Galicia | |
| Osikowski | Strzelno - Prussia | |
| Osimowicz | Glogowiec, Lodz - Russia | |
| Osina | Krasnystaw - Russia | |
| Osinczuk | Hnilice, Toki - Galicia | |
| Osiniak | Badkowo Koscielne, Plock - Russia | |
| Osinski | Barcin - Prussia | |
| Osinski | Blenna - Russia | |
| Osinski | Brzesc Kujawski - Russia | |
| Osinski | Chelmza (Culmsee) - Prussia | |
| Osinski | Czarnkow - Prussia | |
| Osinski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Osinski | Gradzanowo, Sierpc - Russia | Catholic |
| Osinski | Karnkowo - Russia | |
| Osinski | Kowal - Russia | by Wloclawek |
| Osinski | Kutno - Russia | |
| Osinski | Mogilno - Prussia | |
| Osinski | Mokre, Grudziadz - Prussia | |
| Osinski | Niewiescin - Prussia | |
| Osinski | Nowy Targ - Galicia | |
| Osinski | Ojrzanow - Warsaw | |
| Osinski | Orchowo - Prussia | |
| Osinski | Plowez, Bydgoszcz - Prussia | |
| Osinski | Skulsk - Russia | |
| Osinski | Slupca, Konin - Russia | |
| Osinski | Strzelno - Prussia | |
| Osinski | Trzebieszow - Russia | parish: Trzebieszow |
| Osinski | Wenecja, Gniezno - Prussia | |
| Osinski | Wizajny - Russia (now Lithuania) | |
| Osinski | Wloclawek - Russia | |
| Osinski | Zblag, Wloclawek - Russia | |
| Osinski | Znin - Prussia | |
| Osiowski | Jaslo - Galicia | |
| Osip | Dumbel - Russia | |
| Osipiuk | Knychowek, Drohiczyn - Russia | |
| Osipiuk | Knychowek, Drohiczyn - Russia | 1755-1790 |
| Osipow | Rajsk, Bialystok - Russia | |
| Osipowicz | Kaletnik - Russia | |
| Osipowicz | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Osipowicz | Lejpuny - Russia (now Lithuania) | |
| Osipowicz | Merecz (Merkine) - Russia (now Lithuania) | |
| Osipowicz | Nowy Dwor, Lida - Russia (now Lithuania) | |
| Osipowicz | Rososza, Podlasie - Russia | |
| Osipowicz | Troki Town - Russia / Lithuania | 1908 |
| Osipowicz | Wilno - Russia (now Lithuania) | |
| Osisek | Lipnica Wielka, Orawa - Galicia | |
| Osiwlalski | Blaszki, Konin - Russia | |
| Oskar | Raszkow, Ostrow Wlkp - Prussia | |
| Oskarbski | Skrzyszow, Tarnow - Galicia | |
| Oskard | Szczucin - Galicia | |
| Oskerka | Kalinowka Koscielna, Bialystok - Russia | 1760-1780 |
| Oskierko | Vilno - Polish Kingdom | Vilno notary records, 1610-1810 |
| Oskierski | Mlawa - Russia | Evangelic |
| Oskirko | Wilno - Russia (now Lithuania) | 1742-1747 |
| Oskwarek | Lipnica Wielka, Orawa - Galicia | |
| Oslawski | Grabowiec, Lublin - Russia | |
| Oslizlo | Wola Zglobienska, Zglobien - Galicia | |
| Oslonski | Swiebodzin - Galicia | parish: Poreba Radlna |
| Osmalek | Gostynin - Russia | |
| Osmalek | Plock - Russia | Marriages, 1850-1880, parish: Duninow |
| Osmanski | Gradzanowo, Sierpc - Russia | Catholic |
| Osmanski | Jezewo, Swiecie - Prussia | cemetary |
| Osmanski | Kcynia - Prussia | |
| Osmanski | Plowez, Bydgoszcz - Prussia | |
| Osmanski | Radzyn, Plock - Prussia | |
| Osmanski | Zielona (by Zuromin), Mlawa - Prussia | |
| Osmialowski | Plowez, Bydgoszcz - Prussia | |
| Osmialowski | Podgorze - Prussia | Torun suburb |
| Osmianin | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Osmianowicz | Lask, Lodz - Russia | |
| Osmianski | Kaletnik - Russia | |
| Osmieniuk | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Osmola | Boby, Lublin - Russia | |
| Osmolinski | Czestoborowice - Russia | |
| Osmolowski | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Osmolski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Osmolski | Kiernozia - Russia | parish: Kiernozia |
| Osmulski | Trebki, Plock - Russia | |
| Osoba | Stezyca, Lublin - Russia | |
| Osobus | Niepla - Galicia | parish: Szebnie |
| Osochowski | Kutno - Russia | |
| Osorkiewicz | Wielen - Prussia | |
| Osorowski | Tarczyn - Warsaw | |
| Osowicki | Drzycim - Prussia | cemetary |
| Osowicz | Dobroslowo, Konin - Russia | |
| Osowicz | Golina, Konin - Russia | |
| Osowiecki | Lubstow, Konin - Russia | |
| Osowski | Janow Trembowelski, Trembowla - Galicia | |
| Osowski | Nowy Targ - Galicia | |
| Osowski | Przasnysz - Russia | |
| Osowski | Tykocin - Russia | 1890-1905 |
| Osowski | Zielona (by Zuromin), Mlawa - Prussia | |
| Osrodek | Lask, Lodz - Russia | |
| Osrodkowy | Lask, Lodz - Russia | |
| Osrtowski | Brunary, Nowy Sacz - Galicia | |
| Ossig | Breslau - Prussia | |
| Ossipowski | Augustow - Russia | notary records: contracts, inheritances, purchases and sales, 1830-1835 |
| Ossman | Torun - Prussia | civic records, 1876-1888 |
| Ossowski | Bobowo (Bobau) - Prussia | cemetery |
| Ossowski | Budne, Lomza - Russia | |
| Ossowski | Cekcyn - Prussia | |
| Ossowski | Chodecz - Russia | |
| Ossowski | Golina, Konin - Russia | |
| Ossowski | Goniadz and area - Russia | 1677 |
| Ossowski | Goniadz, Grodzkie - Polish Kingdom | Andrzej, 1678-1679, diocese: Vilno |
| Ossowski | Gradzanowo, Sierpc - Russia | Catholic |
| Ossowski | Karnkowo - Russia | |
| Ossowski | Kilo, Lipno - Russia | |
| Ossowski | Krosniewice, Lodz - Russia | |
| Ossowski | Krzywcza, Przemysl - Galicia | |
| Ossowski | Popowo Koscielne - Prussia | |
| Ossowski | Rajgrod, Suwalki - Russia | |
| Ossowski | Rososza, Podlasie - Russia | |
| Ossowski | Sejny, Augustow - Russia | notary records, 1860-1868 |
| Ossowski | Sielec, Wielowies - Galicia | |
| Ossowski | Wloclawek - Russia | 1855 |
| Ossowski | Zakrzow, Wielowies - Galicia | |
| Ossuchowski | Wilno - Russia (now Lithuania) | |
| Ossynski | Bartodzieje Male (Klein Bartelsee), Bydgoszcz (Bromberg) - Prussia | |
| Ost | Kamien, Gorno - Galicia | |
| Ost | Tarnobrzeg - Galicia | census, 1880 |
| Ostachowicz | Knychowek, Drohiczyn - Russia | |
| Ostaniewicz | Ryliszki, Merecz - Russia (now Lithuania) | 1700s |
| Ostaniowicz | Merecz (Merkine) - Russia (now Lithuania) | |
| Ostankiewicz | Tur, Lodz - Russia | |
| Ostanski | Piaski, Lublin - Russia | |
| Ostapciuk | Trebki, Plock - Russia | |
| Ostapek | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Ostapiczko | Dolistowo, Goniadz - Polish Kingdom | 1620-1630 |
| Ostapiuk | Turowiec, Lublin - Russia | |
| Ostapiuk | Werbkowice, Lublin - Russia | Greek catolics |
| Ostapiuk | Zablotow, Sniatyn - Galicia | |
| Ostapow | Trembowla - Galicia | |
| Ostapowicz | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Ostapowicz | Jaminy, Augustow - Russia | marriages, 1800-1868 |
| Ostapowicz | Krasnybor - Russia | |
| Ostapowicz | Krasnybor, Augustow - Russia | cemetery |
| Ostapowicz | Sztabin, Augustow - Russia | |
| Ostapowicz | Tarnowica Polna, Ottynia - Galicia | |
| Ostapowski | Kaletnik - Russia | |
| Ostasz | Jaslo - Galicia | |
| Ostasz | Milejow, Lublin - Russia | |
| Ostaszewski | Gniezno - Prussia | |
| Ostaszewski | Jaslo - Galicia | |
| Ostaszewski | Nosowka - Galicia | |
| Ostaszewski | Rajgrod, Suwalki - Russia | |
| Ostaszewski | Rozan, Ciechanow - Russia | |
| Ostaszewski | Wojslawice, Lublin - Russia | |
| Ostaszewski | Zielona - Russia | |
| Ostenda | Ostrow Wlk - Prussia | |
| Ostephowicz | Bialaszewo, Lomza - Russia | |
| Ostoja-Janiszewski | Sanok - Galicia | |
| Ostrega | Pogorska Wola, Tarnow - Galicia | |
| Ostrogorski | Sanok - Galicia | |
| Ostrokolowski | Janowka, Augustow - Russia | 1880-1890 |
| Ostropolski | Strusow, Trembowla - Galicia | |
| Ostrorog | Czestoborowice - Russia | |
| Ostroski | Karnkowo - Russia | |
| Ostroski | Piaski, Lublin - Russia | |
| Ostroski | Wielen - Prussia | |
| Ostrowicki | Byslaw - Prussia | |
| Ostrowicki | Kilo, Lipno - Russia | |
| Ostrowicki | Lubien Wielki - Prussia | |
| Ostrowicki | Mokowo, Plock - Russia | |
| Ostrowicki | Zale, Plock - Russia | |
| Ostrowidzki | Kurowo - Russia | |
| Ostrowoska | Janowka - Russia | |
| Ostrowski | Badkowo Koscielne, Plock - Russia | |
| Ostrowski | Berzniki - Russia (now Lithuania) | |
| Ostrowski | Brok - Russia | |
| Ostrowski | Brudzew, Konin - Russia | 1808-1835 |
| Ostrowski | Czernice, Ciechanow - Russia | |
| Ostrowski | Dabrowa (near Mlawa), Plock - Prussia | |
| Ostrowski | Debowiec, Jaslo - Galicia | 1746-1774 |
| Ostrowski | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Ostrowski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Ostrowski | Gieguzyn, Troki - Russia (now Lithuania) | 1841, parish: Gieguzyn |
| Ostrowski | Gojsk, Sierpc - Russia | |
| Ostrowski | Golina, Konin - Russia | |
| Ostrowski | Gradzanowo, Sierpc - Russia | Catholic |
| Ostrowski | Jaminy, Augustow - Russia | 1759-1800 |
| Ostrowski | Jaminy, Augustow - Russia | marriages, 1800-1868 |
| Ostrowski | Janowka, Augustow - Russia | 1880-1890 |
| Ostrowski | Kaletnik - Russia | |
| Ostrowski | Kalinowka Koscielna - Russia | 1800s |
| Ostrowski | Kilo, Lipno - Russia | |
| Ostrowski | Konopnica, Lublin - Russia | |
| Ostrowski | Korycin, Bialystok Podlasie - Russia | 1650-1700 |
| Ostrowski | Krakow - Galicia | parish: St. Szczepan |
| Ostrowski | Kroze (Kraziai), Lithuania - Russia | |
| Ostrowski | Lipno - Russia | |
| Ostrowski | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Ostrowski | Lozdzieje - Russia | |
| Ostrowski | Lozdzieje, Grodno - Russia (now Lithuania) | |
| Ostrowski | Merecz (Merkine) - Russia (now Lithuania) | |
| Ostrowski | Nosowka - Galicia | |
| Ostrowski | Obra, Wolsztyn - Prussia | |
| Ostrowski | Opole Lubelskie, Lublin - Russia | |
| Ostrowski | Plock - Russia | Marriages, 1850-1880, parish: Duninow |
| Ostrowski | Pobiedziska, Gniezno - Prussia | |
| Ostrowski | Przasnysz - Russia | |
| Ostrowski | Radziejow - Russia | |
| Ostrowski | Rajgrod, Suwalki - Russia | |
| Ostrowski | Rajsk, Bialystok - Russia | |
| Ostrowski | Sejny - Russia (now Lithuania) | |
| Ostrowski | Sejny - Russia | |
| Ostrowski | Sorokpol, Vilno - Russia (now Lithuania) | 1909 |
| Ostrowski | Szczebra, Augustow - Russia | cemetery |
| Ostrowski | Trembowla - Galicia | |
| Ostrowski | Trzebieszow - Russia | parish: Trzebieszow |
| Ostrowski | Tuliszkow - Russia | |
| Ostrowski | Tykocin - Russia | 1890-1905 |
| Ostrowski | Widelka - Galicia | |
| Ostrowski | Wola Zglobienska, Zglobien - Galicia | |
| Ostrowski | Zaduszniki, Torun - Russia | |
| Ostrowski | Zychlin, Lodz - Russia | 1850-1870 |
| Ostrozniak | Hostow, Ottynia - Galicia | |
| Ostry | Odolanow, Poznan - Prussia | |
| Ostrzycki | Badkowo Koscielne, Plock - Russia | |
| Ostrzykowski | Lysakowo, Przasnysz - Russia | |
| Ostupowicz | Krasnybor - Russia | |
| Ostynski | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Osuch | Nagoszyn, Debica - Galicia | cemetary |
| Osuch | Pleszew, Poznan - Prussia | |
| Osuchowicz | Kalinowka Koscielna - Russia | 1800s |
| Osuchowski | Giewartow, Konin - Russia | |
| Osuchowski | Goniadz and area - Russia | 1677 |
| Osuchowski | Goniadz, Grodzkie - Polish Kingdom | Albert, 1678-1679, diocese: Vilno |
| Osuchowski | Kalinowka Koscielna, Bialystok - Russia | 1760-1780 |
| Osuchowski | Lysakowo, Przasnysz - Russia | |
| Osuchowski | Milejow, Lublin - Russia | |
| Osuchowski | Stare Miasto, Konin - Russia | |
| Osucki | Lipowiec - Galicia | |
| Oswald | Mlawa - Russia | Evangelic |
| Oswiecinski | Troki Town - Russia / Lithuania | 1908 |
| Oswladt | Bielczyny (Bildschon), Torun - Prussia | |
| Osydos | Kumow, Lublin - Russia | |
| Oszajca | Jaslo - Galicia | |
| Oszbic | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Oszczedtowicz | Debowiec, Jaslo - Galicia | 1746-1774 |
| Oszczokowicz | Jaslo - Galicia | |
| Oszerowicz | Augustow - Russia | Augustow county notary records, 1808-1830 |
| Oszerowicz | Lodz, Piotrkow - Russia | |
| Oszfa | Chelm, Lublin - Russia | |
| Oszkandy | Leki Gorne - Galicia | |
| Oszkandy | Leki near Debica - Galicia | |
| Oszkin | Krasnopol - Russia | |
| Oszmanski | Badkowo Koscielne, Plock - Russia | |
| Oszmianski | Wizajny - Russia (now Lithuania) | |
| Oszowski | Piaski, Lublin - Russia | |
| Oszowski | Wloclawek - Russia | 1855 |
| Oszterp | Dolitsowo, Goniadz - Polish Kingdom | Marcin, nobles, 1750-1780, parish: Dolitsowo |
| Osztorp | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Osztych | Trebki, Plock - Russia | |
| Oszust | Plebanowka, Trembowla - Galicia | |
| Oszust | Wojslawice, Lublin - Russia | |
| Oszust | Zaklikow - Russia | |
| Oszust | Zdziechowice - Russia | |
| Oszustowicz | Sedziszow Malopolski - Galicia | |
| Oszwa | Chelm, Lublin - Russia | |
| Oszwa | Czulczyce, Chelm, Lublin - Russia | |
| Otielowicz | Knychowek, Drohiczyn - Russia | 1755-1790 |
| Otlawski | Karniewo - Russia | |
| Otlewski | Osie, Swiecie - Prussia | cemetary |
| Otlewski | Plochocin - Prussia | |
| Otocki | Bogate, Ciechanow - Russia | |
| Otocki | Rzasnia, Lodz - Russia | |
| Otocki | Sieradz - Russia | Felicjan, land records, 1791-1792 |
| Otocki | Sieradz - Russia | Mikolaj, land records, 1791-1792 |
| Otomanski | Tuliszkow - Russia | |
| Otorowski | Boleslawiec, Kalisz - Prussia | |
| Otreba | Odrowaz - Galicia | |
| Otrebski | Zielona (by Zuromin), Mlawa - Prussia | |
| Otremba | Odrowaz - Galicia | |
| Otremba | Plowez, Bydgoszcz - Prussia | |
| Otremski | Borszewice, Szadek - Russia | |
| Ott | Czarnkow - Prussia | |
| Ott | Dobrzyn by Vistula - Russia | |
| Ott | Sierpc, Mazovia - Russia | Evangelics |
| Otte | Raszkow, Ostrow Wlkp - Prussia | |
| Otter | Warsaw - Russia | Lutheran |
| Otterstein | Warsaw - Russia | Lutheran |
| Ottlewski | Lubien Wielki - Prussia | |
| Otto | Krosniewice, Lodz - Russia | |
| Otto | Lodz - Russia | |
| Otto | Maslaki - Prussia | Lutherans, 1857-1860 |
| Otto | Maslaki, Konin - Russia | evangelics |
| Otto | Obrzycko - Prussia | |
| Otto | Pyrzyce (Pyritz) - Prussia | |
| Otto | Siolkowice (Schiolkowitz) - Prussia | |
| Otto | Torun - Prussia | civic records, 1876-1888 |
| Otto | Zgierz, Lodz - Russia | Evangelics, 1820-1850 |
| Ottsmanns | Fordon, Bydgoszcz (Bromberg) - Prussia | |
| Otwiaska | Skalmierzyce, Ostrow Wlk - Prussia | |
| Otwinowski | Krakow - Galicia | parish: St. Szczepan |
| Otwinowski | Spicimierz - Russia | |
| Otwinowski | Uniejow - Russia | |
| Ouydok | Surwiliszki (Surviliskis), Kowno (Kaunas) - Lithuania (Russia) | 1800-1846 |
| Ovsak | Lipnica Wielka, Orawa - Galicia | |
| Owarzany | Dubiecko - Galicia | |
| Owcorz | Siolkowice (Schiolkowitz) - Prussia | |
| Owczarcak | Sedziny - Prussia | |
| Owczarczyk | Konopnica, Lublin - Russia | |
| Owczarek | Badkowo, Plock - Russia | |
| Owczarek | Borki, Kalisz - Prussia | |
| Owczarek | Borszewice, Szadek - Russia | |
| Owczarek | Iwanowice, Kalisz - Russia | 1790-1820 |
| Owczarek | Kucharki, Ostrow Wlk - Prussia | |
| Owczarek | Szadek - Russia | |
| Owczarkiewicz | Krakow - Galicia | parish: St. Szczepan |
| Owczarski | Lichen, Kolo - Russia | |
| Owczarski | Niepla - Galicia | parish: Szebnie |
| Owczarski | Trzebieszow - Russia | parish: Trzebieszow |
| Owczarski | Wasewo - Russia | |
| Owczarski | Wasosze, Konin - Russia | |
| Owczarus | Peczniew - Russia | |
| Owczarz | Dzietrzkowice - Russia | |
| Owczarz | Krzemieniec, Wolyn - Poland | 1919-1935 |
| Owczarz | Zadzim - Russia | |
| Owczarzak | Gebice - Prussia | |
| Owczarzak | Wilczyn, Konin - Russia | |
| Owczasz | Iwanowka, Trembowla - Galicia | |
| Owczyn | Oszmiany - Russia (now Lithuania) | 1906 |
| Owecki | Miescisko, Wagrowiec - Prussia | |
| Owertowski | Ostroda - Prussia | |
| Owicki | Bobowo (Bobau) - Prussia | cemetery |
| Owierkowicz | Vilno - Polish Kingdom | Vilno notary records, 1610-1810 |
| Owiniarski | Wasosze, Konin - Russia | |
| Owisko | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Owoc | Jablonica Polska - Galicia | |
| Owoc | Sanok - Galicia | |
| Owodniewicz | Wilno - Russia (now Lithuania) | |
| Owodzinski | Krakow - Galicia | parish: St. Szczepan |
| Owrukowienic | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Owsiak | Jaslo - Galicia | |
| Owsiak | Lipnica Wielka, Orawa - Galicia | |
| Owsiak | Loszniow, Trembowla - Galicia | |
| Owsiany | Bieniew, Ostrow Wlk - Prussia | |
| Owsiany | Lozdzieje - Russia (now Lithuania) | parish: Lozdzieje |
| Owsiany | Lozdzieje, Grodno - Russia (now Lithuania) | |
| Owsiany | Niemojuny, Troki - Russia (now Lithuania) | |
| Owsiany | Rajgrod, Suwalki - Russia | |
| Owsiejczyk | Kamienna, Dabrowa Bialostocka Podlasie - Russia | 1730-1745 |
| Owsiejko | Suchowola, Bialystok - Russia | cemetery |
| Owsik | Plock - Russia | Marriages, 1850-1880, parish: Duninow |
| Owsiniak | Czaszyn - Galicia | |
| Owsinski | Krakow - Galicia | parish: St. Szczepan |
| Owsinski | Radziwie, Plock - Russia | |
| Owsinski | Wloclawek - Russia | 1750-1800 |
| Owsiuk | Niepla - Galicia | parish: Szebnie |
| Owsnicki | Zukowo (Zuckau) - Prussia | |
| Oyrzanowski | Rusocice, Konin - Russia | 1808-1835 |
| Ozarowski | Brok - Russia | |
| Ozarowski | Knyszyn, Podlasie - Russia | 1740-1770 |
| Ozarowski | Sejny - Russia (now Lithuania) | |
| Ozarowski | Sejny - Russia | |
| Ozarowski | Sejny, Augustow - Russia | notary records, 1860-1868 |
| Ozderski | Zbikow - Warsaw | |
| Ozdobinski | Bogate, Ciechanow - Russia | |
| Ozdobinski | Wysocko Wielkie - Prussia | |
| Ozdowicz | Wilno - Russia (now Lithuania) | |
| Ozdowski | Kiernozia - Russia | parish: Kiernozia |
| Ozdyk | Miescisko, Wagrowiec - Prussia | |
| Ozelski | Jezno, Kowno (Kaunas) - Russia | |
| Ozep | Drohiczyn, Drohiczyn - Polish Kingdom | land records, 1640-1700 |
| Ozga | Jaslo - Galicia | |
| Ozga | Kaletnik - Russia | |
| Ozga | Lwow - Polish Kingdom | Lviv "Grodzkie" records, 1619 |
| Ozga | Tur, Lodz - Russia | |
| Ozga | Wojnicz - Galicia | |
| Ozga | Zaczernie, Rzeszow - Galicia | |
| Ozgaj | Krzywcza, Przemysl - Galicia | |
| Oziemblowski | Wilno - Russia (now Lithuania) | |
| Oziemkowski | Gniezno - Prussia | |
| Ozimek | Plock - Russia | Marriages, 1850-1880, parish: Duninow |
| Ozimek | Targowisko, Lublin - Russia | |
| Ozimina | Kwieciszewo - Prussia | |
| Oziminski | Wasosze, Konin - Russia | |
| Oziminski | Wloclawek - Russia | |
| Ozimkiewicz | Chamsk, Plock - Prussia | |
| Ozlanski | Dolistowo, Goniadz - Polish Kingdom | 1710-1744 |
| Ozlanski | Jaswily, Augustow - Russia | cemetery |
| Ozminkoski | Lubcz, Gniezno - Prussia | |
| Ozog | Kamien, Gorno - Galicia | |
| Ozog | Stobiernia, Rzeszow - Galicia | |
| Ozog | Uchanie, Lublin - Russia | |
| Ozone | Pakruojo - Russia (Lithuania) | 1820-1840, parish: Pakruojo |
| Ozorkiewicz | Wielen - Prussia | |
| Ozorowski | Chelm, Lublin - Russia | |
| Ozowski | Sejny - Russia (now Lithuania) | |
| Ozowski | Sejny - Russia | |
| Ozug | Stobiernia, Rzeszow - Galicia | |
| Ozwink | Breslau - Prussia | |
| Ozykowski | Wilno - Russia (now Lithuania) | 1742-1747 |
| Ozymko | Starzawa, Mosciska - Galicia | |
| Ozyrowicz | Osobnica - Galicia | |
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Last Updated on April 14, 2013