Surnames beginning with O
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- Okiji
- Okike
- Okiki
- Okikiade
- Okikiola
- Okikiolu
- Okill
- Okimo
- Okin
- Okinda
- Okine
- Okines
- Okingo
- Okinikan
- Okino
- Okins
- Okiomah
- Okiotor-Tsere
- Okirie
- O'Kirwan
- Okisor
- Okita
- Okiti
- Okitikpi
- Okito
- Okitolela
- Okiya
- Okkenhaug
- Okker
- Okla
- Okle
- Okleja
- Okley
- Oklinska
- Oklinski
- Oklo
- Oklu
- Okmen
- OkniĊski
- Oko
- Okoabah
- Okoampa
- Okoawo
- Okobi
- Okobia
- Okocha
- Okochi
- Okoda
- Okodaso
- Okodoa
- Okoduwa
- Okoe
- Okoeguale
- Okoemu
- Okogba
- Okogbe
- Okogho
- Okogun
- Okogwa
- Okogwu
- Okoh
- Okoi
- Okoigun
- Okoi-Obuli
- Oko-Jaja
- Okoji
- Okojie
- Okoko
- Okokon
- Okokoro
- Okol
- Okoli
- Okolidoh
- Okolie
- Okolo
- Okolocha
- Okolonji
- Okolosi
- Okolosie
- Okolot
- Okolotowicz
- Okoluko
- Okom
- Okoma
- Okomah
- Okomayin
- Okomba
- Okome
- Okomi
- Okomoh
- Okon
- Okona-Mensah
- Okondo
- Okondu
- Okonedo
- Okonek
- Okonfo
- Okongo
- Okongwu
- Okoniewski
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.