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Cognomen Doy (Doy , דוי , Дой ) , in the entire world, is quite a common surname. The cognomen Doy is characteristic of Bahrain, where it is quite a rare surname, Bangladesh, where it is a rare surname, and Qatar. Measured by absolute frequency, it is commonest in Indonesia, Bangladesh, and the United Kingdom. Likewise, Doy is the forename as well as the last name.