Family name สมวิราช (สมวิราช 
) , in the world, is an extremely rare surname. The cognomen สมวิราช is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Also, สมวิราช is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สมวิราช | Thailand |