Surnames beginning with O
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- Oldrini
- Oldrior
- Oldrive
- Oldrod
- Oldroid
- Oldroy
- Oldroyd
- Oldroyde
- Oldroyd-Hulme
- Oldroyed
- Oldroyv
- Oldry
- Olds
- Oldschool
- Oldseive
- Oldsen
- Oldsey
- Oldsfield
- Oldsham
- Oldshaw
- Oldship
- Oldsker
- Oldskip
- Oldsome
- Oldson
- Oldstein
- Oldstock
- Oldston
- Oldsvoyd
- Oldsworth
- Oldsworthy
- Oldt
- Oldthrow
- Oldtmann
- Oldtoft
- Oldult
- Oldum
- Olduz
- Oldvenshaw
- Oldwall
- Oldway
- Oldwether
- Oldwill
- Oldwock
- Oldwood
- Oldworth
- Oldwoye
- Oldwright
- Oldwyre
- Oldy
- Oldziej
- Oldziejewska
- Ole
- Olea
- O'Lea
- Oleaga
- Oleaga Gonzalo
- Oleage
- Oleahy
- O'Leahy
- Olean
- Olear
- O'Leara
- Olearczuk
- Olearczyk
- O'Learey
- Olearey
- Olearn
- O'Learn
- Olearnik
- Olearry
- O'Learry
- O'Leary
- Oleary
- O' Leary
- O'Leary-Collins
- Oleary-Collins
- O'Leary-Jones
- O'Leary Jones
- O'Leary Solom
- O'Leary-Steele
- O'Leary Steele
- O'Leary-White
- Oleaver
- Olebar
- Olebara
- Ole Boer
- Olech
- Olecha
- Olechniewicz
- Olechno
- Olechnovič
- Olechnowicz
- Olechnowicz-Power
- Olechowska
- Olechowski
- Oleck
- Oleck-Hewett
- Olecki
- Oleday
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.