Cognomen เพชรสุขุม (เพชรสุขุม 
, Petchsukum) , all over the world, is a very rare surname. The cognomen เพชรสุขุม is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Much less frequently, เพชรสุขุม is the forename as well as the last name.