Surname บุตรศักดิ์ (Sonsak 
, บุตรศักดิ์ , Butsak ) , throughout the world, is a rare last name. The last name บุตรศักดิ์ is habitual in Thailand, where it is a rare surname, Turkey, where it is a very rare surname, and the United States, where it is an extremely rare surname. Likewise, บุตรศักดิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sonsak | Turkey, France, United States, Thailand |
| บุตรศักดิ์, Butsak, Buthsak | Thailand |