Family name Rongdech (Rongdech 
) , in the world, is a rare cognomen. The cognomen Rongdech is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname.
Aree, Nattida, Ninyada, Nitipat, Supattra, Arthitaya, Boontida, Kanokwan, Piangkwan, Jindarat, Jiraporn, Nuntipit, Wutichai, Mathukorn, Saengkhae, Sureeporn, Somthawin, Kittipong, Peeraphat, Laphasrada, Thanapong, Thanisorn, Tananon, Jintana, Rawadee, Phapada, Chok, Vipa, Janya, Tawin, Wirut, Somkid, Phubet, Theera, Nittha, Orawan, Thanyatip, Sinchai, Sitanan, Surasuk, Somkait, Somkiat, Sorawit, Chaiyot, Kanjana, Kongpob, Pimnara, Piyawat, Sirirot, and Thanupong