Surname พูนรัตน์ (Poonnarat 
, พูนรัตน์ , Poonrat ) , throughout the world, is a very rare cognomen. The cognomen พูนรัตน์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Also, พูนรัตน์ is the forename as well as the last name.