Surname เพชรนันท์ (เพชรนันท์ 
, Petnun , Phetnun ) , in the world, is a rare last name. The cognomen เพชรนันท์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, เพชรนันท์ is the forename as well as the last name.