Surnames beginning with O
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- O'Faherty
- Ofallaghan
- Ofallen
- O'Fallen
- Ofallon
- O'Fallon
- Ofallora
- O'Fallora
- Ofan
- O'Faogain
- Ofaolain
- O'Farell
- Ofarell
- O'Farraig
- Ofarral
- O'Farral
- Ofarrall
- O'Farrall
- O'Farran
- Ofarran
- Ofarrd
- O'Farrd
- Ofarrel
- O' Farrel
- O'Farrel
- O'Farrell
- Ofarrell
- O' Farrell
- Ofarrill
- O'Farrill
- O'Farrill Avila
- O'Farrol
- Ofarrol
- Ofarroll
- O'Farroll
- O'Fathaigh
- Ofauerck
- O'Fauerck
- O'Fauty
- O'Favell
- Ofavell
- Of Brentwood
- Of Burma
- Ofcarek
- Ofders
- Ofe
- O'Fearghail
- Ofebea
- Ofe-Boakye
- Ofebu Gaetjens
- O'Fee
- Ofee
- Ofeeley
- O'Feeley
- Ofege
- Ofei
- Ofei-Ansah
- Ofei-Atuah
- Ofei-Awuku
- Ofei-Bekoe
- Ofei-Kwatia
- Ofeimu
- Ofeimun
- O'Feinneadha
- Ofei Obuobi
- Ofeisham
- Ofek
- Ofeke
- Ofek Fartouk
- Ofem
- Ofenberg
- Ofenberogh
- Ofenloch
- Ofenor
- Ofeosi
- Ofer
- Ofere
- Ofereh-Mugbeh
- Oferel
- Ofer Hillel
- Oferrall
- O'Ferrall
- Oferrell
- Ofesi
- Ofeur
- Off
- Offa
- Offad
- Offakansi
- Offam
- Offanger
- Offant
- Offara
- Offard
- Offe
- Offe-Burobey
- Offecir
- Offeh
- Offei
- Offei-Addo
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.