Throughout the world, เพชรชัย (เพชรชัย 
, Phetchai , Petchai 
) is a very rare largely masculine, but seldom female first name. The given name เพชรชัย is habitual in South-eastern Asia, particularly Thailand, where it is a rare predominantly boy's, but very seldom girly name. More frequently, เพชรชัย is the last name as well as the forename.