Cognomen พิธิรัตน์ (พิธิรัตน์ 
) , throughout the world, is an extremely rare last name. The surname พิธิรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Likewise, พิธิรัตน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| พิธิรัตน์ | Thailand |