WikiTree Genealogy: O Family Names
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- LODZINSKI to OATTEN
- OATTES to OBENDORF
- OBENDORFER to OBERHULTZ
- OBERIA to OBERST
- OBERSTADT to OBLAD
- OBLADEN to OBRIEN-MAYNARD
- OBRIEN-MILLER to OCAILLEIGH
- OCAIN to OCENASOVA
- OCEO to OCHOT
- OCHOTA to OCLANDER
- OCLARAY to OCZUWNA
- OD to ODEKEN
- ODEKERCKEN to ODIEAR
- ODIEFSKA to ODONOHUGH
- ODONOJU to OECHSLIN
- OECHSNER to OELKERSSTOECKER
- OELKING to OESTEE
- OESTEN to OFANCROFT
- OFANDERTON to OFCLEVES
- OFCLUNYMOR to OFFERDALE
- OFFEREIN to OFHATTONANDDUTTON
- OFHAUGHTON to OFLUMQUHAT
- OFLUND to OFRASSEGHEM
- OFRAY to OFTHEPICTS
- OFTHERNHAM to OGALLAMARTOS
- OGALLARUZ to OGILVYIINDLORDOGILVYOFAIRLIE
- OGILVYIINDOFBOYNE to OGORMAN
- OGORMANYPERICHONDEVANDEUIL to OHARE
- OHAREK to OHLISJAPPIL
- OHLKERS to OHRAZDA
- OHRBERG to OINK
- OINN to OKASINSKI
- OKATY to OKLER
- OKLESHEN to OKUNIEWSKI
- OKUNO to OLAS
- OLASABA to OLBRYCHT
- OLBRYCHT-PALMER to OLDERMANN
- OLDERMANNORHAEGERBAUM to OLEARIUS
- OLEARNICK to OLENYCZ
- OLENYIK to OLFERJEV
- OLFERMANN to OLIJSLAGERS
- OLIJVE to OLIVEH
- OLIVEI to OLIVERYLOZANO
- OLIVERYMORRO to OLLESDOTTER
- OLLESEN to OLMOSARANDA
- OLMOSAVELAR to OLOFSSONALUND
- OLOFSSONBACKALA to OLOWSKI
- OLOWSON to OLSDATTERIVERSEN
- OLSDATTERJACOBSEN to OLSEAN
- OLSEDTR to OLSENKJERR
- OLSENKLEIVAUSTRE to OLSENVERPE
- OLSENVIBE to OLSSONFJELLMAN
- OLSSONFORS to OLTIGEN
- OLTING to OLYNSHINSKI
- OLYNSKY to OMELEA
- OMELET to OMOORE
- OMORAN to ONDERCANIN
- ONDERCIN to ONEILLNEILL
- ONEILLONIEL to ONKEN
- ONKES to ONTRACHEK
- ONTRICH to OOOO
- OOOOO to OOSTEWECHEL
- OOSTFRIESE to OPBROEKMATE
- OPBRUMMELMAN to OPESSA
- OPET to OPOCENSKA
- OPOCENSKY to OPRISON
- OPRISU to OQUIN
- OQUINN to ORBES
- ORBESEN to ORDOFFINDOCHTIE
- ORDOFTHEMERKINCH to ORELLO
- ORELMA to ORGISH
- ORGLANDES to ORISBY
- ORISCHAK to ORLOF
- ORLOFF to ORNBORN
- ORNBURG to OROURAIC
- OROURK to ORRIDGE
- ORRIE to ORSTLY
- ORSTRICH to ORTHMANS
- ORTHMEYER to ORTIZDEVINASPRERUIZ
- ORTIZDEZARATE to ORTMAKER
- ORTMAM to ORZECHOVSKI
- ORZECHOWICZ to OSBUND
- OSBURG to OSGATHARPSURVANT
- OSGATHORP to OSIFYAN
- OSIGN to OSMOND-KETTLESON
- OSMONDMEAGHER to OSRIN
- OSRONNINGEN to OSTALECKE
- OSTALECKI to OSTERGAARDNIELSEN
- OSTERGARD to OSTHUS
- OSTHUSHENRICH to OSTROROG
- OSTROS to OSWEILLER
- OSWEIN to OTERS
- OTERSEN to OTRESKOSHY
- OTREY to OTTENTAL
- OTTENTHAL to OTTMON
- OTTNEDAHL to OUDBIER
- OUDDECKER to OUGGLES
- OUGH to OURIN
- OURINGO to OUTRIDGE
- OUTRIM to OVEL
- OVELGONNE to OVERHEAD
- OVERHEEM to OVERSTAD
- OVERSTAKE to OVRENDEK
- OVRENERICKSONNOONAN to OWERYGROCE
- OWES to OXENHORN
- OXENIDER to OYRAS
- OYRE to OZIOL
- OZIPINKO to O_O