Family name Ajak (Ajak 
, اجاك , อาจา 
) , in the entire world, is quite a common last name. The surname Ajak is habitual in Brunei, where it is quite a common surname, Sudan, where it is quite a rare surname, and South Sudan. Not in comparison with a country's population, it is the most numerous in Sudan, Malaysia, and South Sudan. Very seldom, Ajak is the forename as well as the last name.
| othom rago ajak South Sudanese banker |
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| john bol ajak college basketball player (2020–202_) Syracuse |
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| peter biar ajak South Sudanese peace activist, scholar and former political prisoner (b. 1983) |
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