Surname เธียรหิรัญ (เธียรหิรัญ 
, Theanhirun , Thienhirun ) , all over the world, is a rare family name. The last name เธียรหิรัญ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, เธียรหิรัญ is the forename as well as the last name.