WikiTree Genealogy: O Family Names
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- LODZINSKI to OATTES
- OATTS to OBENDORFER
- OBENDORFF to OBERIEN
- OBERIJE to OBERSTALLER
- OBERSTAR to OBLAK
- OBLAKVONWOLKENSPERG to OBRIEN-SMITH
- OBRIEN-SOBUS to OCALLAGHAN
- OCALLAGHAN-LUDICK to OCFORD
- OCH to OCHOTSKY
- OCHOTTA to OCLERKING
- OCLERY to ODAGAKI
- ODAGAME to ODELBORG
- ODELBRING to ODIJCK
- ODIJK to ODONVAN
- ODOOLE to OEDBAUER
- OEDEFELD to OELLERMAN
- OELLERMANN to OESTERGARD
- OESTERHAUS to OFANHALT-ZERBST
- OFANJOU to OFCORNOUAILLE
- OFCORNWALL to OFFERHOF
- OFFERIE to OFHEDJAZ
- OFHEERS to OFLYN
- OFLYNG to OFREICHENBACH
- OFREIGERSVLIET to OFTHETURKS
- OFTHEUNITEDKINGDOM to OGAN
- OGANAUSKAITE to OGILVYIVTHLORDOGILVYOFAIRLIE
- OGILVYIVTHOFBOYNE to OGORZELSKA
- OGORZELSKI to OHAROLD
- OHARON to OHLMANNBABCOCK
- OHLMAR to OHREEN
- OHREL to OIO
- OIODAWJ to OKBAMIKAEL
- OKE to OKLUNGEN
- OKLYE to OKURZALY
- OKUSA to OLASFEN
- OLASHANSKY to OLCHAWA
- OLCHEFSKE to OLDERSHOF
- OLDERSLETTEN to OLEAS
- OLEASCHMIDT to OLERICH
- OLERIEN to OLFKE
- OLFKY to OLIMPIACASTELLOBRANCO
- OLIMPIAFREITAS to OLIVEIRABUSICHIA
- OLIVEIRACABRAL to OLIVETTI
- OLIVETTO to OLLEVIER
- OLLEVOET to OLMOSLEON
- OLMOSLOPES to OLOFSSONBURE
- OLOFSSONBURMAN to OLPHERTSEN
- OLPHIE to OLSDATTERKVERNSVEEN
- OLSDATTERLANDSTAD to OLSEN-LOVAAS
- OLSEN-LUNDE-ELTUN-TASA to OLSENKVERNSVEEN
- OLSENKYLLINGSTAD to OLSESEN
- OLSETH to OLSSONHASSEL
- OLSSONHAST to OLTMER
- OLTMEYER to OLYSLAG
- OLYSLAGERS to OMELLETTE
- OMELSON to OMOSSA
- OMOTA to ONDERICK
- ONDERISIN to ONELTON
- ONELY to ONNAINTYDITEETCHECOPAR
- ONNAINTYDITETCHECOPAR to ONUFREJ
- ONUFRICHUK to OORDENBAG
- OORDIJK to OOSTHUIJZEN
- OOSTHUIS to OPDECAPPE
- OPDECOELDEWEIJ to OPFFER
- OPFFERMAN to OPOO
- OPOOHINA to OPSAND
- OPSANGER to ORACIC
- ORACOY to ORBOIN
- ORBON to ORDONEZDELEON
- ORDONEZFIERRO to ORENDOR
- ORENDORF to ORHAN
- ORHANEN to ORIVO
- ORIWANOWSKIIWANAUSKAS to ORLOVSZKY
- ORLOW to ORNELASDACOSTA
- ORNELASDELGADILLO to OROZCOCANO
- OROZCOCAPARROS to ORROZ
- ORRPALMER to ORTADO
- ORTAG to ORTIN
- ORTINAU to ORTIZGOMES
- ORTIZGOMEZ to ORTOLON
- ORTOMAN to ORZO
- ORZOL to OSCARSSON
- OSCAVI to OSHANNA
- OSHANNASSEY to OSIOWY
- OSIPA to OSMUNDSONKLOSTER
- OSMUNDSONNYGARD to OSSAUER
- OSSAVARAS to OSTASCHINSKI
- OSTASENKO-BOGDANOFF to OSTERHOUDOSTERHOUT
- OSTERHOUDT to OSTIR
- OSTIS to OSTROWICZאוסטרוביץBAFOREMARRIED
- OSTROWICZBAFOREMARRIED to OSZCZEDLOWICZ
- OSZEK to OTHELL
- OTHELLA to OTSTADT
- OTSTEKLEVE to OTTERDAL
- OTTERDIJK to OTTOMENI
- OTTOMEYER to OUDENAARDEN
- OUDENAAREN to OUILLEN
- OUILLET to OUSBY
- OUSDAHL to OUVERSDATTER
- OUVERSON to OVERACK
- OVERACKER to OVERHULTSER
- OVERHULTZ to OVERUS
- OVERVEEL to OVSIANIKOV
- OVSIANIKOVA to OWLER
- OWLERHEAD to OXLARDE
- OXLEE to OZAK
- OZAKI to OZONAL
- OZONG to O_O