Cognomen ลำใย (Lamyai 
, Lumyai 
, Lamlai 
) , across the world, is a rare family name. The surname ลำใย is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, Myanmar, and Malaysia, where it is an extremely rare surname. More prevalently, ลำใย is the forename as well as the last name.