Surnames beginning with O
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- Onisei
- Onisemiuc
- Onisemo
- Onisha
- Onishchenko
- Onishea
- Onishi
- Onishile
- Oni-Sholaja
- Onisick
- Onisiforou
- Onisk
- Onisko
- Onisor
- Onisoru
- Oniss
- Onisseit
- Onissiphorou
- Onistsuk
- Oniszczuk
- Onita
- Onitie
- Onitilo
- Onitiri
- Onitiri-Coker
- Onitolo
- Onitskansky
- Onitsuka
- Onitt
- Oniunas
- Onivus
- Oni-Williams
- Oniwinde
- Oniwon
- Oniya
- Oniye
- Oniyelu
- Oniyere
- Oniye-Thomas
- Oniyide
- Oniyide-Coker
- Oniyon
- Onizuka
- Onja
- Onjon
- Onjumbe
- Onkal
- Onkar
- Onkell
- Onken
- Onkenhout
- Onkeyonwu
- Onkily
- Onkin
- Onkka
- Onkoba
- Onkok
- Onkosi
- Onks
- Onkst
- Onkundi
- Onland
- Onldroyd
- Onley
- Onley-Williams
- Onlilt
- Online
- Onlise
- Onllwyn-Jones
- Onlsnam
- Onlu
- Only
- Onn
- Onnandy
- Onnela
- Onneman
- Onnen
- Onnerfors
- Onnia
- Onnie
- Onning
- Onnink
- Onnions
- Onno
- Ono
- Onoabhagbe
- Onoade
- Onoapoi
- Onobhayedo
- Onobrakpeya
- Onobrauche
- Onochie
- Onoda
- Onodarho
- Onodenalore
- Onodera
- Onodi
- Onodie
- Onodjamue
- Onodu
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.