Family name พงศ์สิษฐ์ (พงศ์สิษฐ์ 
) , in the world, is an extremely rare cognomen. The family name พงศ์สิษฐ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, พงศ์สิษฐ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| พงศ์สิษฐ์ | Thailand |