Cognomen พูนวิทย์ (Poonwit 
, Poonnawit , พูนวิทย์ ) , worldwide, is a very rare surname. The last name พูนวิทย์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, พูนวิทย์ is the forename as well as the last name.