Cognomen Promsang (Promsang 
) , globally, is a rare last name. The cognomen Promsang is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname.
Trai, Aorathai, Kammika, Kobboonlaya, Pantiwa, Pennapa, Prateung, Pittaya, Piyarat, Jumaree, Natapat, Sawitree, Saowaluk, Sittikiat, Supaporn, Auttapon, Aekaphol, Chanchai, Chaiyuth, Kamonwan, Kittisak, Pimkanok, Atchara, Akachai, Amonrat, Supimon, Papon, Tawee, Nutim, Manida, Moltip, Samart, Sunisa, Sunida, Suphat, Apicha, Danusorn, Chaiya, Ladapa, Jhadet, Techit, Nisara, Sarawut, Siriwut, Sirawit, Surapha, Suriyan, Sunanta, Kaseam, and Jaruphon