Cognomen Oki (Oki 
, オキ , Оки 
, and others...) , in the world, is a common surname. The family name Oki is characteristic of Papua New Guinea, where it is quite a rare surname, Nigeria, and Botswana. Measured by absolute frequency, this name is the most popular in Indonesia, Nigeria, and Japan. More frequently, Oki is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Oki | Indonesia, Japan, Brazil, United States, Nigeria |
| オキ | Japan |
| Оки | Russia |
| Окі | Ukraine |
| morihiro oki Japanese photographer, JP (b. 1929) |
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oki setiana dewi Indonesian actress, ID (b. 1989) |
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| scott oki American businessman, US (b. 1948) |
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| peggy oki American skateboarder and surfer, US (b. 1956) |
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| yuji oki (b. 1949) |
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| katsuhiro oki Japanese taekwondo practitioner, JP (b. 1963) |
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| dan oki Artist, HR (b. 1965) |
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| oki yoshiana Indonesian politician (born 1973 in Jakarta), ID (b. 1973) |
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| oki doni siregar (b. 1969) |
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| eiji oki (b. 1969) |
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| oki udayana Indonesian politician (born 1979 in Bandar Lampung), ID (b. 1979) |
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| oki noviandi Indonesian political candidate, ID |
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| oki refianto Indonesian political candidate, ID |
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| t. oki botanist |
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| oki neswan Ph.D. University of Iowa 1997, ID |
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