Surnames beginning with O
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- Onibonooje
- Onibudo
- Onibuje
- Onica
- Onice
- Onichabor
- Onichen
- Oniciuc
- O'Nicol
- Onicol
- Onida
- Onidi
- Onido
- Onieal
- O'Nieal
- Oni-Edigin
- O'Niel
- Oniel
- O' Niel
- O'Nield
- Onield
- Oniele
- O'Niele
- O'Niell
- Oniell
- Onielly
- O'Nielly
- Oniels
- O'Niels
- Onietan
- Onifade
- Onifade-Carroll
- Onifade-Walters
- Onifer
- Oniga
- Onigbanjo
- Onigbinde
- Onigbode
- Onigbogi
- Onigbokun
- Onight
- Onigley
- Onignan
- Oniha
- Oni-Isiahaka
- Oni-Isibor
- Onijagbe
- Oni-Joseph
- Oni Joseph
- Onik
- Onika
- Onikan
- Onike
- Onikeku
- Onikepe Owolabi
- Onikienko
- Onikis
- Onikoro
- Onikosi
- Onikoyi
- Onikoyi-Deckon
- Onila
- Onilado
- Onilari
- Onile
- Onile-Ere
- Onileere
- Onileowo
- Onillon
- Onilner
- Onilogbo
- Onilude
- Onim
- Onimawo
- Onime
- Onimisi
- Onimisi-Smith
- Onimisi Smith
- Onimole
- Onine
- Onines
- Oninuire
- Oni-Ogebule
- Onioi
- Onion
- O'Nion
- Onione
- Onions
- O'Nions
- Onion'S
- Onionvosa Ekpe
- Oniovo-Kukor
- Oniovosa
- Onipede
- Onipko
- Oniru
- Onis
- Onischenko
- Onischuk
- Oniscu
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.