Cognomen Okai (Okai 
, Окай 
) , in the world, is a common family name. The surname Okai is characteristic of Sub-Saharan Africa, particularly Ghana, where it is quite a common surname, Liberia, where it is quite a rare surname, and Nigeria, where it is a rare surname. Very seldom, Okai is the forename as well as the last name.
| kobina okai Ghanaian musician and pioneer of guitar band highlife music and concert party theater, GH (b. 1922) |
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| lawrence okai former Chief of Defence Staff of the Ghana Armed Forces, GH (b. 1934) |
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| samuel okai association football player (b. 1936) |
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| samuel anum okai Ghanaian association football player, GH (b. 1936) |
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stephen okai Ghanaian football player, GH (b. 1989) |
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| atukwei okai Ghanaian poet, cultural activist and academic, GH (b. 1941) |
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| john okai (b. 1941) |
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| nii okai Ghanaian contemporary gospel singer and a choir leader, GH (b. 1977) |
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| sheila okai association football player, GH (b. 1979) |
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| ken okai researcher |
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| guilherme gonçalves okai researcher |
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| david okai researcher ORCID ID = 0000-0002-0298-2031 |
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| y okai researcher (ORCID 0000-0003-2000-4845) |
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| takashi okai researcher, ORCID id # 0000-0003-2422-524X |
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| isaac okai researcher |
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