WikiTree Genealogy: O Family Names
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- LODZINSKI to OATTES
- OATTS to OBENDORFER
- OBENDORFF to OBERIEN
- OBERIJE to OBERSTALLER
- OBERSTAR to OBLAKVONWOLKENSPERG
- OBLALE to OBRIEN-SOBUS
- OBRIEN-STRAIN to OCALLAGHAN-LUDICK
- OCALLAGHAN-WESTROPP to OCHA
- OCHAB to OCHOTZKI
- OCHOVA to OCLLO
- OCLOO to ODAHL
- ODAHLEN to ODELENS
- ODELGA to ODILEHASTIAN
- ODILL to ODORCZUK
- ODORE to OEDEMANN
- OEDEN to OELLING
- OELLINGER to OESTERIE
- OESTERING to OFANTWERP
- OFAOLAIN to OFCRAIGNISH
- OFCRAIGSTONANDCROMARTY to OFFERLIE
- OFFERLIN to OFHELESIES
- OFHELLEBEKE to OFMACLACHLAN
- OFMAER to OFRENGO
- OFRENZO to OFTHEWESTSAXONS
- OFTHEWINDCLAN to OGANIZA
- OGANNON to OGILVYLADYCLOVA
- OGILVYLADYCRAIGSTON to OGOZALEK
- OGOZALY to OHARRAH
- OHARRE to OHLMER
- OHLMESDAHL to OHRENBAUM
- OHRENBAUN to OIRBANNS
- OIRBANS to OKEARN
- OKEARNEY to OKMIN
- OKNANAGAM to OKUSKA
- OKUTSU to OLASOLO
- OLASOMENDIZABAL to OLCHESKI
- OLCHINETSKY to OLDERVIK
- OLDERWORTH to OLEBEARE
- OLEBENSKI to OLERS
- OLERSZ to OLFS
- OLFSDOTTER to OLINBARQUIN
- OLINCK to OLIVEIRACHECHI
- OLIVEIRACOELHO to OLIVIA
- OLIVIE to OLLEY-COPE
- OLLEY-JONES to OLMOSMONTOYA
- OLMOSMUNOZ to OLOFSSONDAHLBERG
- OLOFSSONDRAKEFRANVASTBO to OLPINSKI
- OLPP to OLSDATTERLISLOW
- OLSDATTERLONNUMSEIE to OLSEN-STONEBLIGE
- OLSEN-SYNORADZKI to OLSENLEIN
- OLSENLEIRBAKK to OLSHAK
- OLSHAKER to OLSSONHOLM
- OLSSONHUSS to OLTRAMARE
- OLTREMARI to OLZARD
- OLZAVAL to OMELY
- OMELYAK to OMPHALIUS
- OMPHROY to ONDERLINDE
- ONDERLINDEN to ONERATAKENRAT
- ONERHEIM to ONNEBRINK
- ONNEKEN to ONUKI
- ONULIAK to OORLOG
- OORNECKE to OOSTHUIZEN
- OOSTHUIZENAKANELLAKABOTHA to OPDEESE
- OPDEGEEST to OPGARDEN
- OPGELDER to OPORTO
- OPP to OPSCHOOR
- OPSENDEK to ORADE
- ORADOU to ORBOWMAN
- ORBU to ORDONEZROCAFUL
- ORDONEZSABALETE to ORENGARAGETHE
- ORENGO to ORHENBAUM
- ORHENBAUN to ORIZENCO
- ORIZONDO to ORLSCHLEGER
- ORLTON to ORNELASVASCONCELOS
- ORNELAZ to OROZCOFRANCO
- OROZCOGALINDO to ORRUBU
- ORRUEGO to ORTALE
- ORTALIZ to ORTISDEARAMAYO
- ORTISI to ORTIZHALCONERO
- ORTIZHERNANDEZ to ORTONOBESBALLETBO
- ORTONOBESESPUNYES to OSABEN
- OSACHIE to OSCHEA
- OSCHEGGER to OSHANNON
- OSHANSKY to OSIPOVI
- OSIPOVICH to OSMUNN
- OSMUNOROSMAN to OSSBAND
- OSSCO to OSTASZ
- OSTASZEWSKA to OSTERHUES
- OSTERHUISS to OSTLE
- OSTLENDER to OSTROWSKE
- OSTROWSKI to OSZLANSZKY
- OSZLONYAI to OTHER
- OTHER-WINDSOR to OTSUKI
- OTSURU to OTTERLEI
- OTTERLEINE to OTTOPAL
- OTTORFER to OUDENES
- OUDENHAVE to OUIMENT
- OUIMET to OUSELEYSWAN
- OUSEN to OUVRARDDITLAPERRIERE
- OUVRARDLAPERRIERE to OVERAND
- OVERARD to OVERILL
- OVERIN to OVERVOORDE
- OVERVOORDEN to OVSTHUS
- OVSTTUN to OWLWALKSINTHEHOUSE
- OWMAN to OXMAN
- OXMANN to OZANAM
- OZANCUP to OZORESYFROILAZ
- OZORIO to O_O