Cognomen Vilachai (Vilachai 
) , globally, is a very rare surname. The cognomen Vilachai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, Vilachai is the forename as well as the last name.
Pimrat, Pongsin, Yanawut, Phongsin, Phraewnapha, and Watcharapong