Cognomen ประพงษ์ (ประพงษ์ 
, Prapong 
, Praphong ) , across the world, is a rare last name. The family name ประพงษ์ is characteristic of Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname. Also, ประพงษ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Pruprong, Praphong, ประพงษ์ | Thailand |
| Prapong | United States, Thailand |