Cognomen Olusegun (Olusegun 
, Олусегун 
) , around the world, is a widespread surname. The surname Olusegun is characteristic of Nigeria, where it is quite a common surname, Niger, where it is quite a rare surname, and Iceland. Not in comparison with a country's population, it is the most numerous in Sub-Saharan Africa, particularly Nigeria, Niger, and Benin. Likewise, Olusegun is the forename as well as the last name.
| ajose olusegun British boxer, NG (b. 1979) |
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| odeneye olusegun politician, NG |
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| sunday j olusegun researcher (ORCID 0000-0002-2479-0540) |
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| christiana olusegun researcher, ORCID id # 0000-0001-7208-0095 |
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| ajibade samson olusegun Nigerian politician, NG |
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| ifedayo olusegun association football player, NG (b. 1991) |
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| olakunle olusegun Nigerian footballer, NG |
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