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Globally, Khamthongsuk (Khamthongsuk ) is an extremely rare unknown gender forename. Much more frequently, Khamthongsuk is the last name as well as the forename.
คำทองสุข
Saithan, Somchai, Arunthip, Nanthida, Sutthawee, Rungnapha, and Phramaha Tawatchai