Cognomen ยศชัย (ยศชัย 
, Yotchai 
, Yoottachai ) , globally, is a rare surname. The family name ยศชัย is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, and Malaysia, where it is an extremely rare surname. Also, ยศชัย is the forename as well as the last name.