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Cognomen Doolan (杜兰 , Дулан , Doolan ) , across the world, is quite a common last name. The surname Doolan is habitual in Ireland, where it is quite a common surname, Australia, where it is quite a rare surname, and New Zealand. Measured by absolute frequency, the name is most common in Australia, the United Kingdom, and the United States. Much less frequently, Doolan is the forename as well as the last name.