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