Last name พิชัยรัตน์ (พิชัยรัตน์ 
, Pichairat , Phichairat ) , in all the world, is quite a rare family name. The surname พิชัยรัตน์ is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname. Much less frequently, พิชัยรัตน์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Pichairat, Bhichairat, Phichairat, พิชัยรัตน์ | Thailand |
Phichairatana, Phichairath, Phichairut, Pichainrat, Pichairatana, Pichairath, Pichairati, and Pichairuth