Cognomen บุญยพันธ์ (บุญยพันธ์ 
, Boonyaphan ) , all around the world, is a very rare family name. The last name บุญยพันธ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, บุญยพันธ์ is the forename as well as the last name.