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Surname Ağa (Aga , Ağa , Ага ) , throughout the world, is a common last name. The cognomen Ağa is habitual in Albania, where it is quite a common surname, Norway, and Azerbaijan, where it is quite a rare surname. Measured by absolute frequency, it is commonest in India, Ethiopia, and Nigeria. Likewise, Ağa is the forename as well as the last name.