Cognomen Ja'Afar (Ja'Afar 
) , in the world, is quite a rare last name. The family name Ja'Afar is habitual in South-eastern Asia, particularly Brunei, where it is quite a common surname, Malaysia, and Singapore, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Malaysia, Nigeria, and Indonesia. Very seldom, Ja'Afar is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ja'Afar | Brunei, Singapore, Indonesia, Nigeria, Malaysia |
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ja'afar mahmud adam Islamic scholar, NG (b. 1960) |
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| rogayah ja'afar researcher |
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| ja'afar abdul el hakh Sudanese politician, SD |
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| ja'afar othman Malaysia politician, MY |
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| ja'afar abubakar magaji Nigerian politician |
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| sebastian ja'afar Indonesian political candidate, ID |
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| fairuzeta ja'afar researcher |
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| ja'afar nuhu ja'afar researcher (ORCID 0000-0003-2895-2866) |
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| tengku abdul ja'afar |
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| mohd rodzi ja'afar |
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| tengku ahmad tengku abdul ja'afar |
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