Cognomen พิชัยพิทยาธร (พิชัยพิทยาธร 
) , across the world, is an extremely rare last name. The cognomen พิชัยพิทยาธร is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| พิชัยพิทยาธร | Thailand |