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Cognomen Promthai (Promthai ) , globally, is a very rare surname. The last name Promthai is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
พรหมไทย
Phaka, Somjai, Amporn, Trakul, Supansa, Prateong, Taimtan, Warakron, and Warinda