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Surname Selby (Selby , Селби , سيلبي) , in the entire world, is a common last name. The cognomen Selby is characteristic of British Virgin Islands, where it is quite a common surname, Isle of Man, and Ghana, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Ghana. Very seldom, Selby is the forename as well as the last name.