Family name ปิยราช (Piyarat 
, ปิยราช , Piyaraj ) , around the world, is a rare last name. The cognomen ปิยราช is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname, Indonesia, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Measured by absolute frequency, this name is the most popular in Thailand, Indonesia, and the United States. More prevalently, ปิยราช is the forename as well as the last name.