Cognomen Khongsak (Khongsak 
) , throughout the world, is a very rare family name. The family name Khongsak is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Predominantly, Khongsak is the forename as well as the last name.
Supo, Chuenkailars, Bupphamart, Kortrakul, Paengsanit, Peerakham, Phuriteerangkun, Puriteerangkun, Lorungroj, Janphuang, Taengphinyo, Thiangtum, Tejavanija, Wongchomsin, Sinprasoet, Suntithumboon, Srisawasdi, Khongkhaem, Khongsawas, Pinyopusarerk, Hiranprueck, Sangkhamanon, Chonlahan, Chaichana, Sribundang, Sungkamurin, Yutan, Maijan, Sripan, Ninrujee, Subphaudom, Srikaeo, Aolueknoi, Kusomsub, Reewong, Tuisuep, Dechakhamphoo, Makarunkamol, Sakrinpanichkul, Srasrisom, Chueakrung, Khosawad, Khooditthalert, Phadeeratpornsuk, Punchornmas, Laopoksap, Hunphanich, Wijasika, Muenruang, and Wisutthirangsan