Surname ถิรวงศ์ (ถิรวงศ์ 
, Tirawong ) , around the world, is an extremely rare cognomen. The surname ถิรวงศ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Likewise, ถิรวงศ์ is the forename as well as the last name.