Surnames beginning with O
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- Oswelt
- Oswelton
- Oswend
- Oswent
- Oswestry
- Oswick
- Oswicke
- Oswiecimski
- Oswiecinski
- Oswill
- Oswin
- Oswin Bateman
- Oswolbiston
- Oswold
- Oswondroyce
- Oswood
- Osworth
- Oswould
- Osy
- Osyathorp
- Osych
- Osy-Eneze
- Osyeneze
- Osypenko
- Osypiuk
- Osypiw
- Osypov
- Osypova
- Osytek
- Osz
- Oszadlik
- Oszajca
- Oszal
- Oszcygiel
- Oszczapinski
- Oszczepalinski
- Oszczyk
- Osze
- Oszenda
- Oszkinis
- Oszkó
- Oszlanszki
- Oszlari
- Oszmaniec
- Oszmann
- Osztovits
- Osztreicher
- Osztrogonacz
- Oszust
- Oszywa
- Ot
- Ota
- Otabil
- Otabor
- Otabor Omoruyi
- Otabun
- Otache
- Otaegui
- Otagaki
- Otagburuagu
- Otah
- Otahal
- Otaiba
- Otaibi
- Otaifa
- Otaify
- Otaigbe
- Otaiku
- Otaily
- Otaka
- Otake
- Otakho
- Otakhogbogie
- Otaki
- Otakomaiya
- Otakoya
- Otalor
- Otalora
- Otalvaro
- Otalvaro Monsalve
- Otalvora
- Otambul
- Otamchande
- Otamendi
- Otamendi Lopez
- Otamingson
- Otampasidis
- Otanaka
- Otanez
- Otani
- O'Tani
- Otanicar
- Otanke
- Otano
- Ota-Ogie
- Otaqui
- Otar
- Otara
- Otaran
- Otarashvili
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.