Surnames beginning with O
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- Ortigosa
- Ortin
- Ortino
- Ortis
- Ortiz
- Ortiz de Urbina
- Ortiz Fernandez
- Ortiz Garcia
- Ortiz Martinez
- Ortiz Perez
- Ortizsanchez
- Ortkrass
- Ortlepp
- Ortlieb
- Ortlock
- Ortloff
- Ortman
- Ortmann
- Ortmanns
- Ortmans
- Ortmayer
- Ortner
- Orto
- Ortola
- Ortolan
- Ortolani
- Ortolano
- Ortoli
- Orton
- Ortone
- Orton-Jay
- Orton-Jones
- Ortori
- Orts
- Ortseifen
- Ortt
- Orttewell
- Ortton
- Ortu
- Ortun
- Ortuno
- Ortuzar
- Ortwein
- Ortyl
- Ortzen
- Oru
- O'Ruairc
- Oruambo
- Orubo
- Orubu
- Oruç
- Oruche
- Oruci
- Orucu
- Orue
- Orueta
- Oruga
- Oruganti
- Orugbo
- Oruitemeka
- Orukotan
- Orukpe
- Orulebaja
- Orum
- Oruma
- Orumbie
- Orumwense
- Orun
- Orungbamila
- Orungbeja
- Orungbemi
- Orunmuyi
- Orunsolu
- Orunta
- Orus
- Oruwari
- Oruye
- Oruz
- Orvain
- Orvant
- Orvell
- Orven
- Orves
- Orvice
- Orville
- Orvin
- Orving
- Orvis
- Orviss
- Orwa
- Orwako
- Orwat
- Orwell
- Orwick
- Orwig
- Orwill
- Orwin
- Orwood
- Ory
- Oryakhail
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.