Last name สมฤทธิ์เดชะ (สมฤทธิ์เดชะ 
) , throughout the world, is an extremely rare surname. The surname สมฤทธิ์เดชะ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| สมฤทธิ์เดชะ | Thailand |
ธนัทอร, and กิตติยอห์น