Surnames beginning with O
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- Orea
- O'Ready
- Oreagan
- Oreagba
- Oreal
- O'Reardon
- Orebajo
- Orebanwo
- Orebi Gann
- Orebine
- Orebiyi
- Orebowale
- Orecchia
- Orecchio
- Orecchioni
- Orechoff
- Oredein
- Oredeko
- Oredola
- Oredowicz
- Oredoyin
- Oredugba
- Oree
- O'Reefe
- Orefelt
- Oreffo
- Orefice
- Orefuja
- Orefuwa
- O'Regan
- Oreggio
- Oregin
- Oregon
- Orehawa
- Oreiley
- Oreill
- O'Reilley
- O'Reilly
- O'Reilly-Cicconi
- O'Reilly-Hyland
- O'Reily
- O'Reirdan
- Oreiro
- Oreja
- Orejaš
- Orejobi
- Orejuela
- Orejupe
- Orekan
- Orekhov
- Orekogbe
- Orekoya
- Orekyeh
- Orel
- Orelaja
- Orell
- Orella
- Orellana
- Orellana-Fitch
- Orelowitz
- Orels
- Orelu
- Orelusi
- Orem
- Oremakinde
- Oreman
- Oremosu
- Oremule
- Oremus
- Oremuyiwa
- Oren
- Orena
- Orencas
- Orendain
- Orenden
- Orendowicz
- Orenga
- Orenge
- Orengo
- Orens
- Orenstein
- Orentas
- Orenuga
- O'Reordan
- Orepitan
- Orer
- Orere
- Orerment
- Orero
- Orerton
- Oresanwo
- Oresanya
- Orescanin
- Oreschnick
- Oresegun
- Oreshkov
- Oreskovic
- Oreston
- Oreszczyn
- Oretade
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.