Family name ธนสมสวัสดิ์ (ธนสมสวัสดิ์ 
) , throughout the world, is an extremely rare cognomen. The family name ธนสมสวัสดิ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| ธนสมสวัสดิ์ | Thailand |