Surname บุญเย็น (บุญเย็น 
, Boonyen 
, Bunyen 
) , throughout the world, is quite a rare family name. The last name บุญเย็น is habitual in Thailand, where it is quite a rare surname, Japan, where it is a rare surname, and Australia, where it is a very rare surname. Much less frequently, บุญเย็น is the forename as well as the last name.