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Last name Piyanach (Piyanach ) , around the globe, is an extremely rare cognomen. Predominantly, Piyanach is the forename as well as the last name.
ปิญะณัช, and ปิยะนัจ
Rodfai, Katepan, Kotpakdee, Gatepan, Lounseng, and Patcharapongsak