Cognomen พลอยประพัฒน์ (Ployprapat 
, พลอยประพัฒน์ ) , all around the world, is a rare family name. The last name พลอยประพัฒน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, พลอยประพัฒน์ is the forename as well as the last name.