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Worldwide, Cailean (Cailean ) is a rare gender-neutral first name. The first name Cailean is habitual in Ireland, where it is a rare male name, the United Kingdom, where it is a very rare primarily masculine, but very seldom feminine name, and the United States, where it is a very rare unisex name. More prevalently, Cailean is the last name as well as the forename.