Last name พีรวงศ์ (พีรวงศ์ 
, Pirawong , Phirawong ) , all over the world, is a very rare family name. The surname พีรวงศ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, พีรวงศ์ is the forename as well as the last name.