Family name พงศ์เศรษฐ์ (พงศ์เศรษฐ์ 
, Pongsaweth ) , globally, is an extremely rare last name. The cognomen พงศ์เศรษฐ์ is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, พงศ์เศรษฐ์ is the forename as well as the last name.