Cognomen Kumthong (Kumthong 
) , across the world, is a rare last name. The cognomen Kumthong is habitual in Thailand, where it is a rare surname, and the United States, where it is an extremely rare surname.
Mali, Wannisa, Wichian, Suntaree, Supapach, Settapol, Akekarut, Apiradee, Krittika, Phongpan, Rattakorn, Jatuporn, Tanyarat, Natchaya, Nichapat, Nutnaree, Nutdanai, Vanussuda, Suraphant, Settakarn, Atchareewan, Kittiphat, Jaruwan, Rittiya, Rattana, Pakhwan, Sala, Anun, Rung, Lada, Urai, Udon, Sanan, Sakol, Sirot, Seeta, Phatrapha, Anunt, Orpan, Somang, Chusit, Pairee, Jariya, Noppol, Sukanda, Athipat, Chataya, Keerati, Petch, and Phicharat