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Across the world, Piyadech (Piyadech ) is an extremely rare unknown gender first name. Very seldom, Piyadech is the last name as well as the forename.
ปิยะเดช, and พิยะเดช
Malai, Nimkam, Srichai, Pienkan, Prommoon, Chaisombat, and Arkarapotiwong