Cognomen Promwong (Promwong 
, พรมวงษ์ , พร้อมวงศ์) , across the world, is quite a rare last name. The surname Promwong is habitual in South-eastern Asia, particularly Thailand, where it is quite a rare surname.
Lek, Bungon, Bunphu, Kanika, Panida, Preena, Pirunya, Rampai, Ratree, Rabeab, Jaruek, Jumrus, Narong, Nikorn, Veerin, Issaya, Orawan, Wandee, Wipada, Yanisa, Umawadee, Manirat, Bangon, Chanon, Apiwit, Apisit, Noi, Pang, Phut, Pung, Sakol, Alisa, Anong, Pipat, Leela, Janya, Maliwan, Tawan, Manoch, Mayura, Malisa, Sunisa, Somsak, Somnuk, Anucha, Arthit, Apiruk, Apirom, Yupha, and Sasinon