Family name ประถมชัย (ประถมชัย 
) , all over the world, is a very rare cognomen. The surname ประถมชัย is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, ประถมชัย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ประถมชัย | Thailand |