Surname เพ็ญเพ็ชร (เพ็ญเพ็ชร 
, Phenphet ) , in the world, is an extremely rare family name. The family name เพ็ญเพ็ชร is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, เพ็ญเพ็ชร is the forename as well as the last name.