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Globally, Thammaphet (Thammaphet , ธรรมเพชร ) is an extremely rare unknown gender first name. Much more frequently, Thammaphet is the last name as well as the forename.
ธรรมเพ็ชร์
Suphat, Chuchip, Kraiwat, Pannita, Prasert, Preecha, Damrong, Monthira, Suriwimon, Nitikarn, Nongkran, Chinchuta, Narongsak, and Thipphawan