Cognomen พลอยรักษ์ (Ployrak 
, พลอยรักษ์ ) , all over the world, is a very rare family name. The cognomen พลอยรักษ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, พลอยรักษ์ is the forename as well as the last name.