Cognomen Phromjak (Phromjak 
) , all over the world, is a very rare last name. The cognomen Phromjak is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname, and Malaysia, where it is an extremely rare surname.
Somchai, Sutthida, Nipaporn, Warakorn, Wirittinan, Phanupong, and Pitcharunya