Cognomen 岡 (Oka 
, 강 
, 岡 
) , across the world, is a widespread family name. The last name 岡 is habitual in South Korea, where it is a widespread surname, Egypt, where it is quite a common surname, and Ivory Coast. Measured by absolute frequency, this name is the most popular in South Korea, Indonesia, and Egypt. Much less frequently, 岡 is the forename as well as the last name.
| 岡正雄 Japanese ethnologist and academician, JP (b. 1898) |
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| 岡 茂雄 JP (b. 1894) |
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| 岡淳一 badminton player, JP (b. 1920) |
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| 岡広子 badminton player, JP (b. 1920) |
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| 岡三郎 Japanese literary scholar, JP (b. 1929) |
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| 岡仁詩 JP (b. 1929) |
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| 岡照雄 JP (b. 1930) |
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| 岡千秋 Japanese composer, JP (b. 1950) |
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| 岡のりこ Japanese actor and seiyū, JP (b. 1956) |
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| 岡ノ谷一夫 Japanese ethologist, JP (b. 1959) |
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| 岡エリ Japanese mangaka, JP (b. 1975) |
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| 岡雅子 Japanese seiyū, JP |
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| 岡あゆみ Japanese actress, JP (b. 1983) |
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| 岡ひとみ badminton player, JP (b. 1986) |
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| 岡卓磨 Japanese association football player, JP (b. 1991) |
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