Cognomen Piyang (Piyang 
, ปิยัง ) , around the world, is a rare family name. The family name Piyang is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, Philippines, and Malaysia, where it is an extremely rare surname. Not in comparison with a country's population, it is commonest in Philippines, Thailand, and India. Much less frequently, Piyang is the forename as well as the last name.