Cognomen Phichaikamonthawat (Phichaikamonthawat 
) , in all the world, is a very rare family name. The surname Phichaikamonthawat is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phichaikamonthawat | Thailand |
Piyawat, and Issayaporn