Surnames beginning with O
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- O'Sulluvan
- O'Sullvan
- Osul-Ochieng
- Osulsen
- Osuly
- Osumah
- Osuman
- Osumanu
- Osumba
- Osumdeko
- Osumdina
- Osumi
- Osumili
- Osumuo
- Osun
- Osuna
- Osunbade
- Osunbayo
- Osun-Benjamin
- Osunbor
- Osunbunmi
- Osund
- Osundairo
- Osunde
- Osundeko
- Osunde-Nnadi
- Osundina
- Osund Ireland
- Osundun
- Osunfisah
- Osunfisan
- Osung
- Osunga
- Osungbesan
- Osungboun
- Osunkiyesi
- Osunkoya
- Osunkunle
- Osunkwo
- Osunlalu
- Osunlana
- Osunmakinde
- Osunmakinwa
- Osunmi
- Osunneye
- Osunremi
- Osunrinade
- Osunrinde
- Osunro
- Osunsade
- Osunsami
- Osunsanami
- Osunsanmi
- Osun-Sanmi
- Osunsanya
- Osunsina
- Osunta
- Osuntogun
- Osuntokun
- Osuntola
- Osuntoye
- Osuntubo
- Osunwa
- Osuobeni
- Osuocha
- Osuoha
- Osuohia
- Osuolale
- Osupeng
- Osurkova
- Osusami
- Osusky
- Osusu Tevie
- Osuteye
- Osutton
- Osuya
- Osvald
- Osvaldo
- Osvaldová
- Osvalds
- Osvath
- Osvog Ii
- Osvold
- Oswal
- Oswald
- Oswald Jacobs
- Oswald-Jemmott
- Oswald Jones
- Oswald-Jones
- Oswald-Nicholls
- Oswalds
- Oswall
- Oswalt
- Osward
- Osway
- Osweiler
- Oswell
- Oswell-Jones
- Oswell Jones
- Oswell-Penton
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.