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Cognomen Keelan (Keelan ) , worldwide, is quite a rare last name. The surname Keelan is habitual in Ireland, where it is quite a rare surname, New Zealand, and Australia, where it is a rare surname. Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Australia. Also, Keelan is the forename as well as the last name.