Family name Thongsrijun (Thongsrijun 
) , in the world, is a very rare cognomen. The family name Thongsrijun is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Thongsrijun | Thailand |
Surachai, Pornnapa, Pissamorn, and Pongsakorn