Cognomen พิรุณมาศ (Pirunmas 
, พิรุณมาศ , Bhirunmas ) , in all the world, is an extremely rare last name. The surname พิรุณมาศ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, พิรุณมาศ is the forename as well as the last name.