Cognomen พลอยสกุล (พลอยสกุล 
, Gemsakul, Geamsakul) , in the world, is a very rare family name. The family name พลอยสกุล is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, พลอยสกุล is the forename as well as the last name.