Cognomen พงศ์เศรษฐศิริ (พงศ์เศรษฐศิริ 
) , throughout the world, is an extremely rare family name. The cognomen พงศ์เศรษฐศิริ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| พงศ์เศรษฐศิริ | Thailand |