Cognomen ทุ้ย (Thui 
, ทุ้ย) , throughout the world, is a rare last name. The cognomen ทุ้ย is habitual in South-eastern Asia, particularly Malaysia, where it is a rare surname, Myanmar, and Vietnam, where it is a very rare surname. Likewise, ทุ้ย is the forename as well as the last name.