Surnames beginning with O
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- Oreton
- Orette
- Oretti
- Oretuga
- Orey
- Oreyeni
- Orf
- Orfali
- Orfally
- Orfani
- Orfanides
- Orfanidis
- Orfanidou
- Orfanos
- Orfanou
- Orfanoudakis
- Orfao
- Orfeur
- Orfford
- Orfi
- Orfield
- Orfila
- Orford
- Org
- Orga
- Orgall
- Organ
- Organe
- Organer
- Organisciak
- Organista
- Organne
- Organs
- Orgar
- Orgas
- Orgathorpe
- Orgazi
- Orge
- Orgee
- Orgee-Tudor
- Orgel
- Orgell
- Orgen
- Orger
- Orges
- Orghici
- Orghidan
- Orgil
- Orgile
- Orgill
- Orgin
- Orgler
- Orgles
- Orgon
- Orgood
- Orgovan
- Orgovanyi
- Orgram
- Orgueil
- Orham
- Orhan
- Orhanli
- Orharhuge
- Orhewere
- Orhiere
- Orhiunu
- Orhnial
- Orhon
- Orhue
- Orhurhu
- Ori
- Oria
- O'Riada
- Oriade
- Oriahi
- Oriaifo
- O'Riain
- Oriakhel
- Oriakhi
- Oriaku
- Orian
- Oriana
- Oriani
- Orias
- Oribhabor
- Oribine
- Oribunmi
- Oricchio
- Orick
- Oridge
- Oridota
- Oridupa
- Orie
- Oriedi
- Orieji
- Oriel
- Orieley
- Orielley
- Orielly
- O'Riely
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.