Surnames beginning with O
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- Osterman
- Ostermann
- Ostermayer
- Ostermayr
- Ostermeier
- Ostermeier-Heidelberg
- Ostermeir
- Ostermeyer
- Ostermeyer-Berg
- Ostermiller
- Ostermoor
- Osterop
- Osteroth
- Osterreich
- Osterreicher
- Osterried
- Osterrieder
- Osterrieth
- Osters
- Osterstock
- Osterstuck
- Ostersvoldt
- Ostertag
- Ostervig
- Ostervold
- Ostervoll
- Osterwald
- Osterwalder
- Oster Warriner
- Osterweil
- Ostet
- Ostewill
- Ostfeld
- Ostgaard
- Ostgren
- Osthans
- Ostheim
- Ostheimer
- Osthen
- Osther
- Osthereine
- Osthoff
- Ostholt
- Osthowski
- Osthues
- Osthus
- Osti
- Ostic
- Ostick
- Ostick Kings
- Ostick-Sergeant
- Ostie
- Ostien
- Ostiguin
- Ostiguy
- Ostijn
- Ostil
- Ostill
- Ostime
- Ostin
- Ostinelli
- Osting
- Ostingue
- Ostini
- Ostinque
- Ostins
- Ostiowicke
- Ostir
- Ostisty
- Ostlar
- Ostle
- Ostlear
- Ostleer
- Ostler
- Ostler-Beech
- Ostler Coal
- Ostlere
- Ostler Harris
- Ostley
- Ostley-Tidd
- Ostli
- Ostlie
- Ostli East
- Ostlier
- Ostliff
- Ostliffe
- Ostling
- Ostlund
- Ostlundh
- Ostlund-Maile
- Ostlygen
- Ostman
- Ostmann
- Ostmeier
- Ostmeyer
- Ostmo
- Ostner
- Osto
- Ostoby
- Ostocke
Surnames shown in bold text represent around 90% of the population of Great Britain. All other names are very uncommon in the UK and we are unlikely to have any useful data on them.