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Surname Aby (Aby , אבי , Абий ) , all around the world, is a common cognomen. The cognomen Aby is habitual in Ivory Coast, where it is quite a common surname, United Arab Emirates, where it is quite a rare surname, and Brunei. Measured by absolute frequency, it is the most numerous in Indonesia, Ethiopia, and Ivory Coast. More prevalently, Aby is the forename as well as the last name.