Family name Adelaja (Adelaja 
) , throughout the world, is a common cognomen. The family name Adelaja is characteristic of Nigeria, where it is quite a common surname, Niger, where it is quite a rare surname, and the United Kingdom, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Nigeria, Niger, and the United States. Likewise, Adelaja is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Adelaja | Australia, United Kingdom, United States, Niger, Nigeria |
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sunday adelaja Founder of the Embassy of God, NG (b. 1967) |
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| adesoji adelaja Nigerian academic (b. 1956) |
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| abimbola adelaja chess player (b. 1968) |
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| abraham adelaja Nigerian footballer, NG (b. 1988) |
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