Cognomen พลหิรัญ (Ponhirun 
, พลหิรัญ , Plonghiran) , in the world, is a very rare family name. The cognomen พลหิรัญ is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, พลหิรัญ is the forename as well as the last name.