Family name Adjak (Adjak 
) , throughout the world, is a rare last name. The cognomen Adjak is habitual in South-eastern Asia, particularly Philippines, where it is a very rare surname, Indonesia, and Malaysia, where it is an extremely rare surname. Much less frequently, Adjak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Adjak | Philippines, Brazil, Malaysia, India, Indonesia |