Cognomen สมสวัสดิ์ (Somsawat 
, สมสวัสดิ์ , Somsavath 
) , all over the world, is quite a rare surname. The surname สมสวัสดิ์ is habitual in Laos, where it is quite a rare surname, Thailand, and the United States, where it is a very rare surname. Also, สมสวัสดิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Somsawat | Italy, United States, Thailand |
| สมสวัสดิ์, Somsawas | Thailand |
| Somsavath | United States, Canada, Laos, France |
Samsawade, Somsavat, Somsawad, Somsaward, Somsawart, Somsawasdi, Somsawatdi, Somsswat, and Somswasdi