Cognomen Sithai (Sithai 
) , in the entire world, is a very rare family name. The family name Sithai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More frequently, Sithai is the forename as well as the last name.
Ram, Lal, Ouk, Thav, Khaeongsun, Vajarodaya, Khotsimeuang, Ponnusamy, Kaewnimitr, and Sellathurai