Surnames beginning with O
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- Ostrovschi
- Ostrovska
- Ostrovski
- Ostrovskis
- Ostrovsky
- Ostrowicki
- Ostrowiecki
- Ostrowka
- Ostrowska
- Ostrowski
- Ostrowsky
- Ostrowskyj
- Ostruter
- Ostry
- Ostrycharz
- Ostryn
- Ostrysz
- Ostrzyzek
- Ostuni
- Ostvig
- Ostwald
- Ostwind
- Ostynowicz
- Osu
- Osuagwu
- Osuala
- Osubor
- Osubu
- Osuch
- Osuchowska
- Osuchowski
- Osuchukwu
- Osude
- Osuebi
- Osueke
- Osugo
- Osuh
- Osuhon
- Osuide
- Osuigwe
- O'Suilleabhain
- Osuji
- Osukporu
- Osuku-Opio
- Osula
- Osulivan
- Osullevan
- O'Sullivan
- O'Sullivan-Robertson
- O'Sullivan-Smith
- O'Sullivan-Wade
- O'Sullivan-Wallace
- O'Sulllivan
- O'Sullvan
- Osumah
- Osuman
- Osumanu
- Osumba
- Osumi
- Osun
- Osuna
- Osunbade
- Osunbayo
- Osun-Benjamin
- Osunbor
- Osunbunmi
- Osunde
- Osundeko
- Osundina
- Osundun
- Osunfisan
- Osung
- Osungbesan
- Osunkoya
- Osunkunle
- Osunkwo
- Osunlana
- Osunmakinde
- Osunneye
- Osunrinade
- Osunro
- Osunsade
- Osunsami
- Osunsanmi
- Osunsanya
- Osunsina
- Osuntogun
- Osuntokun
- Osuntola
- Osuntubo
- Osunwa
- Osuobeni
- Osuoha
- Osuolale
- Osupeng
- Osuteye
- Osuya
- Osvald
- Osvaldo
- Osvaldová
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.