Cognomen พงษ์พิโรจน์ (พงษ์พิโรจน์ 
, Pongpiroj , Pongpirojn ) , across the world, is a very rare family name. The family name พงษ์พิโรจน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Pongpirojn, พงษ์พิโรจน์, Pongpiroj, Pongphiroj | Thailand |