Throughout the world, Krongsak (Krongsak 
) is an extremely rare boy's forename. Much less frequently, Krongsak is the last name as well as the forename.
Oysawat, Rattanakasa, Charoenchit, Vattanasil, Rattanakul, Suwanmanee, Chulamorkodt, Songraksa, Ngaemsurach, Paramacharoenroj, Jinajunta, Boonchat, Boranrat, Apakarat, Sareenan, Piyarak, Boonlue, Ngaoosa, Cotpat, Pimsawan, and Permpoontanalap