Cognomen เพชรกล้า (Phetkla 
, เพชรกล้า, Petchkla ) , in the world, is a very rare surname. The cognomen เพชรกล้า is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, เพชรกล้า is the forename as well as the last name.