Cognomen Promjun (Promjun 
) , globally, is a rare family name. The family name Promjun is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, Promjun is the forename as well as the last name.
Leab, Supansa, Somsong, Sorawan, Skawduen, Anupong, Chanapa, Chaiwat, Kanlaya, Kittima, Kwanjai, Patipan, Panadda, Panuwat, Paveena, Pajaree, Pongpan, Rungtip, Jintana, Jitlada, Tanabat, Thanika, Sarapee, Manvika, Yanisa, Egapong, Jead, Wira, Santi, Anong, Arnon, Benya, Punya, Wasin, Wijit, Yodkwan, Tosawat, Suchat, Artita, Arunya, Atiwat, Apinya, Buppha, Panjai, Paijit, Prakob, Phujida, Juntip, Sopida, and Teranuch