Family name Prathoomthong (Prathoomthong 
) , globally, is a very rare last name. The cognomen Prathoomthong is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, Prathoomthong is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Prathoomthong | Thailand |