All around the world, เพ็ญรัตน์ (เพ็ญรัตน์ 
, Penrat 
, Phenrat ) is a rare primarily feminine, but scarcely male first name. The first name เพ็ญรัตน์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare predominantly feminine, but very seldom male name. Also, เพ็ญรัตน์ is the last name as well as the forename.