Family name Chaiyasak (ชัยศักดิ์ 
, ไชยศักดิ์ , Chaiyasak 
) , in the entire world, is a rare surname. The last name Chaiyasak is habitual in Thailand, where it is quite a rare surname, and Finland, where it is a very rare surname. More frequently, Chaiyasak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| ชัยศักดิ์, ไชยศักดิ์ | Thailand |
| Chaiyasak | Finland, Thailand |