Cognomen รัตนาวงศ์ (รัตนาวงศ์ 
, Ruttanawong ) , globally, is a very rare last name. The last name รัตนาวงศ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Also, รัตนาวงศ์ is the forename as well as the last name.