Surname Krongsak (Krongsak 
) , throughout the world, is an extremely rare family name. The surname Krongsak is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more prevalently, Krongsak is the forename as well as the last name.
Oysawat, Rattanakasa, Charoenchit, Vattanasil, Rattanakul, Suwanmanee, Chulamorkodt, Songraksa, Ngaemsurach, Paramacharoenroj, Jinajunta, Boonchat, Boranrat, Apakarat, Sareenan, Piyarak, Boonlue, Ngaoosa, Cotpat, Pimsawan, and Permpoontanalap