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Cognomen Kigan (Keegan , Kigan , Кіган ) , in the world, is a common surname. The family name Kigan is characteristic of Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Ireland. Likewise, Kigan is the forename as well as the last name.