Surname สมวงษ์ (สมวงษ์ 
, Somwong 
) , globally, is quite a rare family name. The cognomen สมวงษ์ is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname, Singapore, where it is a rare surname, and Malaysia, where it is a very rare surname. Not in comparison with a country's population, it is commonest in Thailand, Singapore, and the United States. Very seldom, สมวงษ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สมวงษ์ | Thailand |
| Somwong | Thailand, United States, Malaysia, Singapore, India |