Surnames beginning with O
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- Okahio
- Okahisa
- Okai
- Okaidja
- Okai Hall
- Okaikoi
- Okai-Koi
- Okain
- O'Kain
- Okaine
- O'Kaine
- Okaiwa
- Okaiyeto
- Okajima
- Okaka
- Okakah
- Okakpu
- Okaku
- Okal
- Okala
- Okali
- Okalla Ndi
- Okam
- Okamatsu
- Okamba
- Okamback
- Okamoto
- Okamoto-Kearney
- Oka Mseleku
- Okamura
- Okan
- Okanaju
- Okandeji
- Okander
- Okandju
- O'Kane
- Okane
- Okane Boal
- Okanga Ajwang
- Okang Boye
- Okangi
- Okaniwa
- Okanlami
- Okanlawon
- Okanmelu
- Okano
- Okanovic
- Okanrende
- Okanta-Ofori
- Okanta Ofori
- Okantey
- Okany
- Okanya
- Okara
- O'Kara
- Okarma
- Okaro
- Okarter
- Okaru
- Okas
- Okasako
- Okasha
- Okasheh
- Okashima
- Okasi
- O'Kasi
- Okasia
- Okasshety
- O'Kasshety
- Okatan
- Okato
- Okatova
- Okattah
- Okauchi
- Okawa
- Okawara
- Okay
- O'Kay
- Okayama
- Okayasu
- Okay Tomac
- Okazaki
- Okazawa
- Okba
- Okbagabir
- Okbajohannes
- Okbamichael
- Okbay
- Okbe
- Okber
- Okcay
- Okcu
- Okdi
- Okdsun
- Oke
- Okeach
- O'Keach
- Okeagu
- Okeahialam
- Okeakpu
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.