Family name Oka (Oka 
, オカ , اوكا 
, among others...) , across the world, is a common last name. The family name Oka is habitual in Egypt, where it is quite a common surname, Ivory Coast, and Indonesia, where it is quite a rare surname. Also, Oka is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Oka | Egypt, Japan, Indonesia, Democratic Republic of the Congo, Ivory Coast |
| オカ | Japan |
| اوكا | Libya, Egypt, Sudan, Saudi Arabia |
| أوكا | Egypt |
| Ока | Ukraine, Russia, Kazakhstan |
Carioca, Daiga, Oca, Oga, Ohga, Ohka, Okay, Oke, Okà, Oká, Okâ, Oką, Ooga, Ooka, Oque, Oķà, Taiga, Òka, Òkà, Òkã, Òķà, Ókà, Óká, Óką, Óķá, Óķă, Ôka, Ôkà, Ôká, Ôkâ, Ôkã, Ôķâ, Ôķã, Ôķă, Õka, Õkâ, Õkã, Õķâ, Ōka, Ŏkặ, Ŏķã, Őká, Őķà, Őķá, Őķã, Őķă, Őķą, Ǿka, Ǿkǻ, Ǿkặ, Ǿķâ, Ǿķǻ, Οκα, Даига, Оока, Таига, אוקה, اوقه, اوکا, ออก, โอกะ, โอคะ, ໂກະ, Ṓḳă, おか, 喔卡, 奥卡, and 岡
| oka shigemasa (b. 1568) |
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| genpō oka (b. 1737) |
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oka rokumon Japanese sinologist (b. 1833) |
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| oka kumaomi (b. 1783) |
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oka gorō Japanese educator (b. 1855) |
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| senjin oka (b. 1833) |
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| seiichi oka painter (1868–1944) (b. 1868) |
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i gusti bagus oka ID (b. 1910) |
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| shigeki oka American journalist, US (b. 1878) |
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| tjokorda oka ID (b. 1896) |
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abhay shreeniwas oka Indian judge, IN (b. 1960) |
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| oka gambir (b. 1900) |
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| hidemichi oka (b. 1902) |
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| hidemiti oka (b. 1902) |
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| ennu oka Finnish sculptor, FI (b. 1913) |
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