Cognomen เลิศทรัพย์ (เลิศทรัพย์ 
, Kertsap , Lerdsap ) , around the world, is a rare last name. The cognomen เลิศทรัพย์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, เลิศทรัพย์ is the forename as well as the last name.