Surnames beginning with O
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- Osikilo
- Osikominu
- Osikorobia
- Osikoya
- Osilade
- Osilaja
- Osilalu
- Osili
- Osilliva
- O'Silliva
- Osillona
- Osilowo
- Osim
- Osima-Dokubo
- Osiman
- Osima-Pringle
- Osimbo
- Osime
- Osimen
- Osimo
- Osimokun
- Osin
- Osina
- Osinaike
- Osiname
- Osinbajo
- Osinbrook
- Osinde
- Osindero
- Osine
- Osineye
- Osinfolarin
- Osing
- Osinga
- Osingbrook
- Osiniagova
- Osiniak
- Osinibi
- Osinin
- Osinkolu
- Osinkowska
- Osinlaru
- Osinloye
- Osinnowo
- Osinoiki
- Osinowo
- Osins
- Osinsanya
- Osinska
- Osinskaja
- Osinski
- Osinski-Stachowicz
- Osinubi
- Osinuga
- Osinuga Adun
- Osinuga-Pindar
- Osinusi
- Osio
- Osiobor
- O'Siochain
- O'Siochru
- Osiogo
- Osiowy-West
- Osip
- Osipau
- Osipczak
- Osipitan
- Osipiuk
- Osipov
- Osipova
- Osipovic
- Osipovs
- Osipowicz
- Osipyan
- Osiris
- Osiro
- Osiruemu
- Osis
- Osisanwo
- Osisanya
- Osisek
- Osisiogu
- Osisioma
- Osita
- Ositadinma
- Ositang
- Osita Ude
- Ositek
- Ositelu
- Ositis
- Osituyo
- Osiuwemu
- Osivaya-Ibrahim
- Osivwemu
- Osiyale
- Osiyale-Osifalujo
- Osiyemi
- Osiyen
- Osiyneye
- Osiyoye
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.