Family name Klangthong (Klangthong 
) , in the world, is a rare cognomen. The cognomen Klangthong is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
Dan, Kanjanut, Krissada, Prapasri, Pornthip, Jirapong, Jiraporn, Tanakrit, Sureerat, Eakaluck, Shinnasin, Surochinee, Poonyanuch, Jiraphong, Nuthathai, Chonnikarn, Pruethiphol, Yaowadee, Phimnaraporn, Siwaburt, Wichein, Sumet, Kosin, Tapin, Apiarpa, Jidapa, Wiriya, Wichai, Saransom, Sathian, Chalong, Kaesinee, Kewalin, Praphan, Thitima, Nalinee, Napatrpong, Supatra, and Sanguanthum