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