Surname Nnaji (Nnaji 
, נגאי 
, نناجي) , in all the world, is a common cognomen. The last name Nnaji is habitual in Sub-Saharan Africa, particularly Nigeria, where it is quite a common surname, Niger, where it is quite a rare surname, and Ghana, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Nigeria, Niger, and the United States. Also, Nnaji is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Nnaji | Nigeria, United States, Ghana, Niger, Morocco |
| נגאי | Israel |
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genevieve nnaji Nigerian actress, producer, and director, NG (b. 1979) |
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| veronica nnaji Nigerian nurse and politician, NG (b. 1940) |
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zeke nnaji American basketball player, US |
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| peace uzoamaka nnaji Nigerian politician, NG (b. 1952) |
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james nnaji Nigerian basketball player, NG |
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| bartholomew o. nnaji Nigerian politician and scientist, NG (b. 1956) |
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| gilbert e. nnaji Nigerian politician, NG (b. 1966) |
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| scott nnaji Nigerian women's basketball coach |
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| cornelius nnaji Nigerian politician |
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| chukwudi a nnaji researcher (ORCID 0000-0002-4132-1922) |
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| nnolim nnaji Nigerian politician |
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| chidozie c nnaji researcher |
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| obiora nnaji college basketball player (1998–1999) Florida |
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| patricia nnaji Nigerian para-athlete, NG |
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| n j n nnaji researcher |
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