WikiTree Genealogy: O Family Names
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- LODZINSKI to OBAID
- OBAILEY to OBERBICHLER
- OBERBICK to OBERLOHR
- OBERLY to OBEVINE
- OBEXER to OBRADY
- OBRAE to OBYLE
- OBYLIN to OCETKOVA
- OCETNIK to OCHSENREITER
- OCHSENREITHER to OCONNELLOROCONNOR
- OCONNELLY to ODDAN
- ODDASON to ODERKERK
- ODERKICK to ODONALD
- ODONALDS to OE
- OEBBECKE to OELL
- OELLEIN to OESTERRIECH
- OESTERRITTER to OFAUGHTON
- OFAURILLAC to OFDEVONSHIRE
- OFDIEGEM to OFFILER
- OFFILIER to OFHOYA
- OFHREITHGOTALAND to OFMOIREABH
- OFMOLDAVIA to OFSA
- OFSACHACHOV to OFVALKENBURG
- OFVARINGIA to OGBURN
- OGBURN-MCCALL to OGIWENS
- OGLA to OGURI
- OGURSKI to OHLEMEIER
- OHLEMEYER to OHNUTKOVA
- OHO to OIODAWJ
- OIOM to OKEITH
- OKEJEGAW to OKPIK
- OKRA to OLAI
- OLAICOPINGENSIS to OLAVSONBERG
- OLAVSONEIMSTAD to OLDENDEITERINCK
- OLDENDEITERINCKS to OLEARCZUK
- OLEARCZYK to OLERT
- OLERTS to OLGUIN
- OLGUINARTEAGA to OLISLAGER
- OLISLAGERS to OLIVERARAMBUL
- OLIVERARIVERA to OLLERGIMENEZ
- OLLERHEAD to OLMOSGARCIA
- OLMOSHERNANDEZ to OLOFSSONFORSMAN
- OLOFSSONFRIMODIG to OLSAVER-PLOOF
- OLSAVSKA to OLSDATTEROSTGARD
- OLSDATTEROVRE-GREEN to OLSENBRIMS
- OLSENBRONBOE to OLSENNORDREBLEKEN
- OLSENNORLIE to OLSONI
- OLSONIFAXNALDEN to OLSTOT
- OLSTREAM to OLWAGE
- OLWAGEN to OMEALY
- OMEARA to OMORGAN
- OMORI to ONDERWYNGAARD
- ONDES to ONEZ
- ONEZDAY to ONOWAY
- ONOYE to OOINK
- OOINKS to OOSTERLEE
- OOSTERLINCK to OPAUSKY
- OPAVA to OPFEL
- OPFELBECK to OPPDYKE
- OPPE to OPTENBORGGREEFF
- OPTENCAMPE to ORASIANU
- ORASKOVICH to ORDELMAN
- ORDELMANS to ORELEON
- ORELEP to ORGREEN
- ORGRINC to ORKIES
- ORKIESE to ORMELING
- ORMELOH to OROBKO
- OROBONO to ORRAKA
- ORRALADOMINGUEZ to ORSON
- ORSONI to ORTI
- ORTI-PLANELLS to ORTIZLADRONDEGUEVARA
- ORTIZLEAL to ORTUZARBULNES
- ORTUZARFORMAS to OSAWA
- OSAWALDT to OSELSKY
- OSEM to OSICKI
- OSICKOVA to OSMOND
- OSMOND-CLENCH to OSSEDRIJVER
- OSSEGE to OSTEGUY
- OSTEI to OSTERN
- OSTERNDORF to OSTRAUJ
- OSTRAUSKAITE to OSUNKHIRINE
- OSUNKHIRINE-MASTA to OTEROVIDAL
- OTEROVINSEIRO to OTSCHOWSKI
- OTSE to OTTERLO
- OTTERLOO to OTTROYNO
- OTTS to OUDIT
- OUDKERK to OULTRAM
- OULTREMONT to OUTKA
- OUTKELT to OVENDEN
- OVENDON to OVERHOLZER
- OVERHORST to OVERVOLD
- OVERVOORDE to OWCZARZAK
- OWCZARZOWNA to OWUSU-SEKYERE
- OWUSUANSAH to OYETUGA
- OYEYEMI to OZIMEK
- OZIMI to O_O