All over the world, เพ็ญชัย (เพ็ญชัย 
, Phenchai , Phengchai 
) is a very rare principally masculine, but scarcely girly given name. The given name เพ็ญชัย is habitual in South-eastern Asia, particularly Thailand, where it is a very rare principally masculine, but scarcely feminine name. Also, เพ็ญชัย is the last name as well as the forename.