Family name ตติยวงศ์ (ตติยวงศ์ 
, Tortidwong , Tatiyawong ) , globally, is a rare cognomen. The family name ตติยวงศ์ is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, ตติยวงศ์ is the forename as well as the last name.