Surnames beginning with O
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- Ontko
- Ontram
- Onu
- Onuaguluchi
- Onuanain
- Onuba
- Onubogu
- Onuchi
- Onuchukwu
- Onuegbu
- Onuekwusi
- Onufade
- Onufer
- Onufrak
- Onufrei
- Onugha
- Onuh
- Onuha
- Onuigbo
- Onuigwe
- Onuiri
- Onuk
- Onukaogu
- Onukegbe
- Onukogu
- Onukwu
- Onukwube
- Onukwubiri
- Onukwugha
- Onuma
- Onumaegbu
- Onumaeme
- Onumah
- Onumonu
- Onunekwu
- Onunkun
- Onunkwo
- Onunwa
- Onuoha
- Onuonga
- Onuora
- Onuorah
- Onur
- Onural
- Onut
- Onuta
- Onutu
- Onuwaje
- Onuzi
- Onuzo
- Onuzulike
- Onuzurike
- Onuzuruike
- Onwa
- Onwasigwe
- Onwere
- Onwhyn
- Onwin
- Onwionoko
- Onwochei
- Onwona
- Onwordi
- Onwu
- Onwuachi
- Onwuachu
- Onwuagha
- Onwualu
- Onwuama
- Onwuamaegbu
- Onwuanibe
- Onwuasoanya
- Onwuazor
- Onwubalili
- Onwubiko
- Onwubolu
- Onwubu
- Onwubuya
- Onwuchekwa
- Onwude
- Onwudike
- Onwudili
- Onwudinjor
- Onwudiwe
- Onwuegbu
- Onwuegbusi
- Onwuegbuzie
- Onwuelo
- Onwuemele
- Onwuemena
- Onwuemene
- Onwuemezia
- Onwuezobe
- Onwufuju
- Onwugbonu
- Onwugbufo
- Onwughalu
- Onwughara
- Onwuje
- Onwujuba
- Onwuka
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.