Cognomen Phouthai (Phouthai 
) , throughout the world, is a very rare surname. The surname Phouthai is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. More prevalently, Phouthai is the forename as well as the last name.
Chakvongsa, Ketsavong, Keoveunxay, Gnothakhoun, Lotkhamnga, Saleumlok, Vorarath, Inthongsay, and Phimmasane