Cognomen เพ็ญมาศ (เพ็ญมาศ 
, Penmat 
) , across the world, is a rare last name. The surname เพ็ญมาศ is characteristic of Thailand, where it is a rare surname, and India, where it is an extremely rare surname. Also, เพ็ญมาศ is the forename as well as the last name.