Family name Phommajan (Phommajan 
) , in all the world, is a very rare last name. The surname Phommajan is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phommajan | Thailand |
Atitaya, Chatree, Tidarat, Pimpilak, and Chonthicha