Surname พลอยพิศุทธิ์ (Ploypisoot 
, พลอยพิศุทธิ์ ) , globally, is a very rare cognomen. The cognomen พลอยพิศุทธิ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, พลอยพิศุทธิ์ is the forename as well as the last name.