Cognomen ทองชัย (Thongchai 
, Tongchai 
, ทองชัย ) , throughout the world, is quite a rare surname. The family name ทองชัย is habitual in Thailand, where it is quite a rare surname, Taiwan, where it is a rare surname, and Malaysia, where it is a very rare surname. In absolute terms, this name is the most popular in Thailand, Taiwan, and China. More frequently, ทองชัย is the forename as well as the last name.