WikiTree Genealogy: O Family Names
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- LODZINSKI to OBAID
- OBAILEY to OBERBILLIG
- OBERBOISTER to OBERMAIER
- OBERMAIR to OBEY
- OBEYENA to OBRAKTA
- OBRAM to OBYRNS
- OBYRON to OCHACHER
- OCHAENKUHN to OCHSL
- OCHSLE to OCONNOER
- OCONNOLEY to ODDENINO
- ODDENWOLLESUND to ODERNHEIMER
- ODERRICK to ODONELL
- ODONELLY to OECH
- OECHEL to OELLINGRATH
- OELLRICH to OESTREECH
- OESTREICH to OFBALDERNOCK
- OFBALGENZAIO to OFDRENTHA
- OFDREUX to OFFINMERE
- OFFINS to OFICER
- OFIDALEVIN to OFMONTFORT
- OFMONTREUIL to OFSAXE-COBURGANDGOTHA
- OFSAXE-WEIMAR-EISENACH to OFVIENNOIS
- OFVINZGAU to OGEE
- OGEEN to OGLEBSY
- OGLEBY to OGWYN
- OGWYNN to OHLENROTT
- OHLENSCHLAEGER to OHOMAIRANGI
- OHONOWSKY to OISHI
- OISSON to OKELLEYCLAGSTON
- OKELLEYOCEALLAIS to OKRINGTON
- OKROGAR to OLAISEN
- OLAISSON to OLAWALE
- OLAWLOR to OLDENKAMP
- OLDENKOTT to OLEASCHMIDT
- OLEATA to OLESDATTERLAAKENES
- OLESDATTERNORDMO to OLHERT
- OLHESS to OLIVA-CURRARI
- OLIVA-GARCIA to OLIVERIA
- OLIVERIE to OLLESDOTTER
- OLLESEN to OLMOSSERNA
- OLMOSSIGALA to OLOFSSONHJORT
- OLOFSSONHOFMAN to OLSCHEFSKA
- OLSCHEFSKI to OLSDATTERRUDIULVEN
- OLSDATTERRUSAINEN to OLSENDAGFINRUD
- OLSENDAHL to OLSENORUD
- OLSENOSTBYE to OLSONMOORE
- OLSONMURRAY to OLSZAK
- OLSZANOWSKI to OLWYN
- OLY to OMEIRA
- OMEISA to OMPHALIUS
- OMPOHHANNUT to ONDISH
- ONDLER to ONGANIA
- ONGARATO to ONSERIO
- ONSETTLER to OOLEY
- OOLEY-BEQUERET to OOSTERVELT
- OOSTERVINK to OPDAHL
- OPDAL to OPGENBREMENT
- OPGENORDT to OPPENANER
- OPPENBORN to OPTHUISINGH
- OPTHULSINGH to ORAVETS
- ORAVETZ to ORDERS
- ORDERSGREG to ORELMA
- ORELOISE to ORIAC
- ORIAGAIN to ORL
- ORLA to ORMIAN
- ORMIE to OROLOV
- OROM to ORREBY
- ORRED to ORSTRICH
- ORSTROM to ORTIVEZ
- ORTIZ to ORTIZMONASTERIOQUINTANA
- ORTIZMONASTERIOROSAS to ORUARC
- ORUARCOFLEINSTER to OSBEN
- OSBERE to OSENTOWSKI
- OSENYA to OSIENSKI
- OSIER to OSMUNDSDTR
- OSMUNDSEN to OSSENBRUGGEN
- OSSENDORF to OSTENDORFT
- OSTENDORP to OSTERSTOEK
- OSTERSTOM to OSTREYKO
- OSTREZI to OSWALDI
- OSWALDII to OTGER
- OTGTESDATTERRAVN to OTT-FILENIUS
- OTT-FUSSLI to OTTERSKY
- OTTERSLATTER to OTVOS
- OTWAIE to OUDY
- OUDYN to OUR
- OURA to OUTSHOORN
- OUTSLAY to OVERACRE
- OVERAKER to OVERKEMPINK
- OVERKIL to OVESNA
- OVESNY to OWENCOOPER
- OWENDALE to OXELEY
- OXELIE to OYOLATOVAR
- OYOS to OZMINKOWSKI
- OZMINT to O_O