Surname ทองเย็น (ทองเย็น 
, Thongyen 
) , all around the world, is quite a rare cognomen. The cognomen ทองเย็น is characteristic of South-eastern Asia, particularly Thailand, where it is quite a rare surname, and Malaysia, where it is a very rare surname. Much less frequently, ทองเย็น is the forename as well as the last name.