Family name สัมฤทธิ์ธา (สัมฤทธิ์ธา 
) , across the world, is an extremely rare cognomen. The cognomen สัมฤทธิ์ธา is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| สัมฤทธิ์ธา | Thailand |