Surname พลศักดิ์ (พลศักดิ์ 
, Phonsak 
, Ponsak 
, along with others...) , around the world, is quite a rare cognomen. The surname พลศักดิ์ is characteristic of Slovenia, where it is quite a rare surname, Thailand, and Bosnia and Herzegovina. In absolute terms, this name is the most popular in Thailand, Nigeria, and Bosnia and Herzegovina. Also, พลศักดิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| พลศักดิ์, Ponlasak | Thailand |
| Phonsak | Laos, Malaysia, Thailand |
| Ponsak | Malaysia, Philippines, Nigeria, United States, Thailand |
| Polsak | Bosnia and Herzegovina, Thailand, Argentina, Slovenia, Brazil |
| Pholsak | United States, Thailand |
| อุดมพร พลศักดิ์ Thai weightlifter, TH (b. 1981) |
|