Globally, สมวาสน์ (สมวาสน์ 
) is a very rare dominantly girly, but infrequently boy's first name. The first name สมวาสน์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare epicene name. Very seldom, สมวาสน์ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| สมวาสน์ | Thailand |