Worldwide, เพียรชัย (เพียรชัย 
, Pianchai , Phianchai ) is a very rare dominantly male, but infrequently feminine given name. The forename เพียรชัย is habitual in South-eastern Asia, particularly Thailand, where it is a rare largely male, but seldom female name. Much less frequently, เพียรชัย is the last name as well as the forename.