All over the world, พลอยสยาม (พลอยสยาม 
, Ployiam ) is a very rare dominantly female, but infrequently male first name. The first name พลอยสยาม is habitual in South-eastern Asia, particularly Thailand, where it is a very rare mostly female, but seldom male name. Very seldom, พลอยสยาม is the last name as well as the forename.