Surname Trongsak (Trongsak 
) , across the world, is an extremely rare last name. Much more frequently, Trongsak is the forename as well as the last name.
Kunin, Kun-In, Munwang, Choodam, Kongrod, Limseng, Yassapan, Sopapong, Bunyahat, Kerdklieng, Kerdkieng, Ramkaroon, Sombutmark, Chanphong, Jaroonchai, and Prasertsopon