Surname ธาดาสมิทธิ์ (ธาดาสมิทธิ์ 
) , in all the world, is an extremely rare cognomen. The cognomen ธาดาสมิทธิ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| ธาดาสมิทธิ์ | Thailand |