Surname Moonjak (Moonjak 
) , in the entire world, is a very rare last name. The cognomen Moonjak is characteristic of Thailand, where it is a very rare surname, and Brazil, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Moonjak | Brazil, Thailand |
Aorawan, Nitiwan, Arorawan, Atsadawoot, Chonticha, and Thitiyaporn