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Family name Kirby (Kirby , קירבי , كيربي) , throughout the world, is a common surname. The family name Kirby is habitual in Saint Vincent and the Grenadines, where it is quite a common surname, Antigua and Barbuda, and Isle of Man (explore the name in all countries). Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia. Very seldom, Kirby is the forename as well as the last name.