Surnames beginning with O
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- Otool
- O'Toole
- Otoole
- O' Toole
- O'Toole-Dincov
- O'Toole-Howes
- Otoole Jnr
- O'Toole-Quinn
- Otoole-Quinn
- O'Toole-Young
- Otoo-Oyortey
- Otopher
- Otor
- Otorkhine
- Otoro
- Otor-Osagie
- Otos
- Otoshi
- Ototahor
- Otote
- Ototobor
- Otovic
- Otoway
- Otoya
- Otoyo
- Otradovec
- Otram
- Otrang
- Otratch
- Otręba
- Otrebska
- Otrebski
- Otremba
- Otrembskaya
- Otrembski
- Otridge
- Otromke
- Otrony
- O'Trony
- Otroshchenko
- Otrray
- Otruba
- Otry
- Ots
- Otsa
- Otse
- Otsemobor
- Otsemobor Igbanoi
- Otshudi
- Otshudy
- Otsman
- Otstot
- Otsu
- Otsubo
- Otsuji
- Otsuka
- Otsuka-King
- Otsuki
- Otsumah
- Otsyula
- Ott
- Otta
- Ottabone
- Ottaby
- Ottaca
- Ottagan
- Ottah
- Ottaiano
- Ottairo
- Ottal
- Ottalagano
- Ottallarin
- Ottaltoran
- Ottan
- Ottani
- Ottanlon
- Ottanton
- Ottar
- Ottara
- Ottard
- Ottarsdottir
- Ottarsen
- Ottarson
- Ottas
- Ottati
- Ottavi
- Ottavian
- Ottavianelli
- Ottaviani
- Ottaviano
- Ottavio
- Ottawary
- Ottaway
- Ottaway Jr
- Ottaway-Reid
- Ottawell
- Otte
- Ottea
- Ottegert
- Ottele
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.