Last name ไพรหิรัญ (ไพรหิรัญ 
, Praihirun ) , around the world, is a very rare surname. The cognomen ไพรหิรัญ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, ไพรหิรัญ is the forename as well as the last name.