Cognomen อมรทรัพย์ (อมรทรัพย์ 
, Amornsap , Amonsap ) , throughout the world, is a rare last name. The surname อมรทรัพย์ is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, อมรทรัพย์ is the forename as well as the last name.