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Surname Banya (Banya , บัญญา , Баня ) , around the globe, is quite a common last name. The surname Banya is habitual in Sierra Leone, where it is quite a common surname, Gambia, where it is quite a rare surname, and Mongolia. Measured by absolute frequency, it most frequently occurs in Japan, Sierra Leone, and Uganda. Also, Banya is the forename as well as the last name.