Surnames beginning with O
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- Osifuwa
- Osigbe
- Osigbesan
- Osigwe
- Osijo
- Osika
- Osikena
- Osikominu
- Osikorobia
- Osikoya
- Osilade
- Osilaja
- Osili
- Osilowo
- Osim
- Osimbo
- Osime
- Osimen
- Osimokun
- Osin
- Osina
- Osinaike
- Osiname
- Osinbajo
- Osinbrook
- Osinde
- Osindero
- Osineye
- Osinfolarin
- Osinga
- Osiniak
- Osinibi
- Osinkolu
- Osinlaru
- Osinloye
- Osinnowo
- Osinoiki
- Osinowo
- Osins
- Osinsanya
- Osinska
- Osinski
- Osinubi
- Osinuga
- Osinusi
- Osio
- O'Siochain
- Osiogo
- Osip
- Osipczak
- Osipitan
- Osipiuk
- Osipov
- Osipova
- Osipovs
- Osipowicz
- Osiris
- Osis
- Osisanwo
- Osisanya
- Osisiogu
- Osisioma
- Osita
- Ositelu
- Ositis
- Osivwemu
- Osiyale
- Osiyemi
- Osiyen
- Oska
- Oskam
- Oskan
- Oskar
- Oskars
- Oskarsen
- Oskarsson
- Osker
- Oskey
- Oskiera
- Oskierko
- Oskiewicz
- Oskin
- Oskins
- Oskis
- Osko
- Oskooee
- Oskooi
- Oskoui
- Oskroba
- Osku
- Oskwarek
- Oskys
- Osland
- Osland-Jones
- Oslar
- Oslavio
- Osle
- Oslear
- Oslen
- Osler
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.