Family name Premruthai (Premruthai 
) , all around the world, is a very rare surname. The surname Premruthai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, Premruthai is the forename as well as the last name.
Untow, Premwattanaphathai, Prachachot, Sanguansin, Hengsoontorn, Tangtrong, Ratanakovit, Khotpanya, Chaihanit, Sornmanee, Malaithong, Tunyuchok, Runbanphaew, Rueangkhong, Pichaiwong, Sripumma, Manothip, Jaiwana, Leardbumrungchai, Khamlue, Kaewfoo, Aphimeatheethamrong, Unthao, Huonthin, Jaidee, Kijvasin, Bunkan, Khruaruan, and Chueamueangphan