Cognomen Kulthirat (Kulthirat 
) , in all the world, is an extremely rare surname. The cognomen Kulthirat is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. More frequently, Kulthirat is the forename as well as the last name.
Mungin, Dokmai, Srimang, Prabjabok, Janmuang, Wuttiakarapaisarn, Sriuchan, Phengsuwan, Saengplai, Prechachan, and Srimahayant