Surname Wangchai (Wangchai 
, วังชัย , วังใจ ) , worldwide, is a rare family name. The surname Wangchai is habitual in Thailand, where it is a rare surname, New Zealand, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Very seldom, Wangchai is the forename as well as the last name.