WikiTree Genealogy: O Family Names
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- LODZINSKI to OATWAY
- OATWELL to OBENHOFF
- OBENHUIJSEN to OBERIVUSIR
- OBERJAKOBER to OBERSTEMEIER
- OBERSTESTEINHORST to OBLATH
- OBLAZNAPEKSA to OBRIENGUTOWSKI
- OBRIENHIGGINS to OCAM
- OCAMAN to OCHANDERENA
- OCHANER to OCHSENBINE
- OCHSENBREN to OCOLLAHAN
- OCOLLINS to ODAMS
- ODAN to ODELMALM
- ODELSON to ODINOT
- ODINS to ODOUD
- ODOUGHERTY to OEFELEIN
- OEFELI to OELSCHALAGER
- OELSCHIG to OESTERSCHULTE
- OESTERT to OFARRELLHUBER
- OFARRELLY to OFDAMASCUS
- OFDARLASTON to OFFESEN
- OFFESSON to OFHOLLAND
- OFHOLLANDSHERIFFOFORKNEY to OFMETHLEY
- OFMETHVEN to OFROTSELAAR
- OFROUMANIA to OFTROY
- OFTSIE to OGAZ
- OGAZONGUTIERREZ to OGILVYOFMUIRTOWNANDCLUNY
- OGILVYOFPOWRIE to OGREYSICK
- OGREZEWALLA to OHEALY
- OHEAR to OHLSEN-THEYS
- OHLSON to OHRN
- OHRNBERG to OIUM-HANSON
- OIUMET to OKELEKE
- OKELEW to OKOOLINA
- OKOON to OLAFBJORKLI
- OLAFESDAUGHTER to OLAUSSONDAHLEN
- OLAUSSONKLING to OLDAKOWSKI
- OLDALE to OLDHAMSTEAD
- OLDHANCE to OLEFSKY
- OLEG to OLESENVALDERHAUG
- OLESENVENAASVALD to OLGYAYDEOLGYA
- OLHA to OLIPHANTII
- OLIPHANTIIIRDLORDOLIPHANT to OLIVEIRARAMOS
- OLIVEIRARANGEL to OLIVOSOTO
- OLIVOSSANTES to OLLINGER
- OLLINGER-SEABY to OLOANE
- OLOBIO to OLOFSSONKRON
- OLOFSSONKROPP to OLSCHEWSKI
- OLSCHEWSKY to OLSDATTERSALBERG
- OLSDATTERSANDSBRATEN to OLSENDAELEN
- OLSENDAGFINRUD to OLSENNORLIE
- OLSENNOSTE to OLSONAANSTAD
- OLSONBEITO to OLSSONTANDBERG
- OLSSONTHOR to OLUFSJUERGENS
- OLUFSON to OMANDAM
- OMANEY to OMICOLI
- OMIDFAR to ON-THE-HILL
- ONA to ONDREJOVICOVA
- ONDREKA to ONGENDUSSON
- ONGER to ONQUE
- ONRAEDT to ONZEN
- ONZI to OOSTENDURP
- OOSTENENK to OOYEN
- OOYMAN to OPDENWEYER
- OPDEOVERGAUW to OPHULS
- OPHUS to OPPERMEERSCH
- OPPERS to OPTHOFF
- OPTHOFTINGH to ORANTIS
- ORANYAK to ORD
- ORD-HUME to ORECHIWA
- ORECHKIN to ORFANT
- ORFANUS to ORIHEL
- ORIHOOD to ORLANS
- ORLANSKA to ORMINSKI
- ORMINSKY to OROCK
- OROCZO to ORR-PATERSON
- ORR-WILSON to ORSI
- ORSI-WENDORFF to ORTEGON
- ORTEGONTRUJILLO to ORTIZDELANDALUCE
- ORTIZDELANDALUCEGONZALEZDEARTAZA to ORTIZVILLA
- ORTIZVILLAMIZAR to ORVESANLUCAS
- ORVICE to OSBERNORMSBY
- OSBERT to OSEN
- OSENACEK to OSHUST
- OSHYER to OSMAK
- OSMALA to OSOVSKI
- OSOWAY to OSSONT
- OSSOP to OSTERBECK
- OSTERBERG to OSTERWISCH
- OSTERWISE to OSTREZI
- OSTRIA to OSUR
- OSURA to OTERMANS
- OTERMAT to OTON
- OTONASHI to OTTENDR
- OTTENEDER to OTTINI
- OTTINK to OUBOTER
- OUBOUSSIER to OUENSDATTER
- OUENSDATTERLIANE to OUOMI
- OUPEYE to OUTLAND
- OUTLAW to OVCARIKAS
- OVCEN to OVERGOOR
- OVERGORE to OVERSHON
- OVERSHOT to OVREGARD
- OVREGJOYSTDAL to OWENSSMITH
- OWENSSR to OXENDALE
- OXENDEN to OYNION
- OYNS to OZIMI
- OZIMIC to O_O