Surnames beginning with O
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- Orr Munro
- Orro
- Orroch
- Orrock
- Orrok
- Orrom
- Orron
- Orros
- Orrow
- Orrs
- Orrston
- Orru
- Orrum
- Orry
- Ors
- Orsag
- Orsak
- Orsatelli
- Orsats
- Orsatti
- Orsband
- Orsben
- Orsbon
- Orsbone
- Orsborn
- Orsborne
- Orsbourn
- Orsbourne
- Orsburn
- Orsburne
- Orsbusson
- Orsby
- Orsel
- Orselli
- Orsen
- Orser
- Orsetti
- Orshansky
- Orsi
- Orsich
- Orsillo
- Orsini
- Orsino
- Orska
- Orski
- Orskov
- Orsler
- Orsman
- Orsmond
- Orso
- Orsola
- Orsolini
- Orson
- Orsoni
- Orsos
- Orsot
- Orssich
- Orssten
- Orst
- Orstall
- Orsten
- Orston
- Orszag
- Orszak
- Orszewski
- Orszulak
- Orszulik
- Ort
- Orta
- Ortaç
- Ortan
- Ortanca
- Ortas
- Ortatepe
- Ortcheson
- Ortchison
- Orte
- Ortega
- Ortega Perez
- Ortego
- Ortegon
- Ortel
- Ortelecan
- Ortelli
- Orten
- Ortenburg
- Ortenzi
- Orter
- Ortese
- Orteseh
- Orteu
- Ortez
- Orteza
- Orth
- Orthmann
- Orthner
- Orthodoxou
- Orths
- Orti
- Ortiger
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.