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Cognomen Danby (دانبي , Danby , דנבי ) , in all the world, is quite a rare family name. The surname Danby is characteristic of Reunion, where it is quite a common surname, Isle of Man, where it is quite a rare surname, and the United Kingdom. Not in comparison with a country's population, the name is most common in the United Kingdom, the United States, and Australia. Much less frequently, Danby is the forename as well as the last name.