Family name Promthep (Promthep 
) , globally, is a rare cognomen. The cognomen Promthep is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Very seldom, Promthep is the forename as well as the last name.
Pin, Bandith, Kannika, Kongsak, Kedwara, Pattana, Pathorn, Pintira, Ranrada, Donlaya, Gitsapong, Luckana, Jarinya, Nawinda, Maneerat, Sunthree, Supachock, Supalerk, Sermchai, Apichart, Kampanat, Kittinut, Chanisa, Apichat, Adisorn, Somchit, Medha, Metta, Sarit, Sunee, Alisa, Tanya, Nanfa, Nipon, Harit, Seksan, Patharee, Chanya, Parada, Jariya, Jittra, Niyada, Wariya, Witoon, Molphaga, Sakepisit, Suriporn, Sukanda, Kreeta, and Pawanphat