Family name สมสินธุ์ (สมสินธุ์ 
) , all around the world, is an extremely rare surname. The cognomen สมสินธุ์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more prevalently, สมสินธุ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| สมสินธุ์ | Thailand |