Cognomen พิทยาจำรัส (พิทยาจำรัส, Phithaayajamrat, Phitayachamrat 
) , globally, is an extremely rare surname. The cognomen พิทยาจำรัส is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Phitayachamrat | Thailand |
Phithayajamrat, Pitayachamrat, Pitayachamrus, Pittayachamrat, Pittayajamrus, Pittayajumrut, Pitthayajamrat, Pitthayajamrus, and Pitthayayajamrat