WikiTree Genealogy: O Family Names
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- LODZINSKI to OATTES
- OATTS to OBENDORFER
- OBENDORFF to OBERIBER
- OBERIEN to OBERSTAINER
- OBERSTALLER to OBLAG
- OBLAK to OBRIEN-SAINT
- OBRIEN-SHAW to OCAK
- OCAKOGLU to OCEPECK
- OCEPEK to OCHOTNICZKY
- OCHOTNY to OCLEAR
- OCLEARY to ODABACHI
- ODABAS to ODEKERKEN-RAMAKERS
- ODEKIRK to ODIER
- ODIERNA to ODONOVAN
- ODONOVAN-BAID to OECHSSE
- OECK to OELKRUG
- OELKUCH to OESTER
- OESTERBROOK to OFANDHAGAIN
- OFANGERTON to OFCODICOTE
- OFCODNOR to OFFEREINS
- OFFERGELD to OFHAWKLEY
- OFHAWTHORN to OFLUNDIE
- OFLUXEMBOURG to OFRAYNEHILL
- OFRCLEONARD to OFTHESCHELDE
- OFTHESENECA to OGALLASALINAS
- OGALLCHOBHAIR to OGILVYIINDOFDESKFORDANDFINDLATER
- OGILVYIINDOFINCHMARTINE to OGORMON
- OGORODNIKOV to OHAREOROHEHIR
- OHARGAN to OHLLSON
- OHLMACHER to OHRBLAD
- OHRBOM to OINONEN
- OINOTAR to OKAWARA
- OKAY to OKLEVIK
- OKLEY to OKUNS
- OKUNSKY to OLASCOAGA
- OLASDATTER to OLBY
- OLBYE to OLDERO
- OLDEROEN to OLEARY-AGOSTA
- OLEARY-LITTERAL to OLEOFORNARIS
- OLEONARD to OLFERTS
- OLFERTSDR to OLILSON
- OLIM to OLIVEIRAALVES
- OLIVEIRABARCELLOS to OLIVET
- OLIVETBROWNELL to OLLESSON
- OLLESTAD to OLMOSDURAN
- OLMOSENRIQUEZ to OLOFSSONBLUSI
- OLOFSSONBOMAN to OLOZAGAMARTINEZDEAGUILLO
- OLOZAGASAENZDENAVARIDAS to OLSDATTERKJETTETORP
- OLSDATTERKJOS to OLSEN-BERG
- OLSEN-BJORNSTAD to OLSENKONGSMO
- OLSENKROG to OLSENVOLLAN
- OLSENVOLSNES to OLSSONFROM
- OLSSONGERWIN to OLTJENG
- OLTKEN to OLYNYKDEMACIO
- OLYONS to OMELIANUK
- OMELINA to OMORGAN
- OMORI to ONDERDIJCK
- ONDERDIJK to ONEILLS
- ONEKEA to ONKSBRIGHT
- ONKSPOPEJOY to ONTYCHUCK
- ONTZ to OOPER
- OOPMANN to OOSTHOF
- OOSTHOORN to OPDEBECK
- OPDEBEECK to OPFELBECK
- OPFELL to OPOLCZYK
- OPOLIN to OPRYSHEK
- OPRYSHKO to OR
- ORA to ORBINATI
- ORBINSKI to ORDONDEZ
- ORDONE to OREMUSEUS
- OREN to ORGOR
- ORGOTOFF to ORISS
- ORISTO to ORLOS
- ORLOSKE to ORNDROFF
- ORNDRUP to OROVUTZ
- OROWAN to ORRINGE
- ORRINGTON to ORSWELL
- ORSY to ORTHSEIFER
- ORTHTRAYER to ORTIZDUARTE
- ORTIZDURAN to ORTMULLERGENANNTRUBEN
- ORTMYER to ORZEL
- ORZELASKAHDRYJA to OSBYRNE
- OSCA to OSGOTHORPE
- OSGUTHORPE to OSIMOWICZZIELINSKA
- OSIN to OSMULSKI
- OSMUM to OSSAGUEMES
- OSSAMERCADO to OSTAPCZUK
- OSTAPENKO to OSTERHAUS
- OSTERHAUT to OSTIGUYDOMINIQUE
- OSTIGUYJR to OSTROV
- OSTROVE to OSWULF
- OSY to OTEY
- OTEYSA to OTROWSKE
- OTRUBA to OTTERBACHER
- OTTERBACK to OTTOBERRY
- OTTOBONI to OUDEHOLLINK
- OUDEJANS to OUGUENARDE
- OUGUST to OURSBORN
- OURSBOURN to OUTTERSIDE
- OUTTERSON to OVENIJNDERS
- OVENOMOR to OVERHOLSER-CHILDS
- OVERHOLSER-WHITE to OVERSVEEN
- OVERT to OVREVOLD
- OVREVOLL to OWILD
- OWILLIAMS to OXESETHER
- OXEY to OYSTERBANKS
- OYSTERMAGGIE to OZMAR
- OZMEHAK to O_O