Surnames beginning with O
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- Oesterman
- Oesterreich
- Oestmann
- Oestreich
- Oestreicher
- Oetegenn
- Oetgen
- Oetiker
- Oetjeun
- Oetken
- Oetker
- Oetsel
- Oetting
- Oettingen
- Oettinger
- Oettl
- Oettle
- Oetzel
- Oetzmam
- Oetzman
- Oetzmann
- Oexle
- Oey
- Oeyre
- Ofallon
- Ofaolain
- O'Farell
- Ofarral
- Ofarrall
- Ofarrel
- O'Farrell
- O'Farrol
- O'Fathaigh
- O'Favell
- Ofe
- Ofebea
- O'Fee
- Ofei
- Ofei-Bekoe
- Ofei-Kwatia
- Ofeimun
- Ofem
- Ofeosi
- Ofer
- Ofere
- Ofereh-Mugbeh
- Oferrall
- Ofesi
- Off
- Offa
- Offam
- Offanger
- Offara
- Offard
- Offe
- Offe-Burobey
- Offeh
- Offei
- Offei-Addo
- Offei-Ansah
- Offei-Essah
- Offel
- Offell
- Offen
- Offenbach
- Offenberg
- Offenborg
- Offens
- Offer
- Offerd
- Offerdal
- Offergelt
- Offerman
- Offermann
- Offermanns
- Offers
- Offersen-Christensen
- Offert
- Offerton
- Offey
- Offia
- Offiah
- Office
- Officer
- Offield
- Offil
- Offiler
- Offill
- Offiller
- Offin
- Offinger
- Offiong
- O'Fflahertie
- Offland
- Offlands
- Offleck
- Offler
- Offles
- Offless
- Offley
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.