Surnames beginning with O
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- Osawaru Osawaru
- Osawaye
- Osawe
- Osawomwenze
- Osayameh
- Osayamwen
- Osayande
- O'Saye
- Osayemi
- Osayi
- Osayimwen
- Osayi Osunbor
- Osayiwu
- Osayomi
- Osayomwanbor
- Osayonamen
- Osaze
- Osazee
- Osazemwinde
- Osaze-Omonuwa
- Osazere
- Osazuwa
- Osazuwa Agbonson
- Osazuwa-Oni
- Osback
- Osbahr
- Osbakk
- Osbalastone
- Osbalderson
- Osbalderston
- Osbalderton
- Osbaldesdine
- Osbaldestin
- Osbaldeston
- Osbaldestone
- Osbaldeston Mitford
- Osbaldinton
- Osbaldisten
- Osbaldiston
- Osbaldistone
- Osbaldson
- Osbaldston
- Osbaldstone
- Osbalteston
- Osban
- Osband
- Osbane
- Osbaston
- Osbean
- Osbeck
- Osbeldeston
- Osbell
- Osben
- Osbend
- Osberg
- Osbern
- Osberne
- Osbernson
- Osberon
- Osberry
- Osberston
- Osberton
- Osbeston
- Osbey
- Osbie
- Osbild
- Osbildston
- Osbinson
- Osbiston
- Osblone
- Osbment
- Osbo
- Osboarn
- Osboinnce
- Osboldaston
- Osboldeston
- Osboldstone
- Osbom
- Osbome
- Osbon
- Osbona
- Osbond
- Osbonde
- Osbone
- Osboon
- Osboone
- Osboourne
- Osbore
- Osborg
- Osborme
- Osborn
- Osborn-Archer
- Osborn Barker
- Osborn-Brown
- Osborn-Cook
- Osbornd
- Osborne
- Os Borne
- Osborne Aca
- Osborne-Bartram
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.