Cognomen เอื้อชัย (Auaychai 
, Auaichai , เอื้อชัย) , in the world, is a very rare family name. The surname เอื้อชัย is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, เอื้อชัย is the forename as well as the last name.