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All over the world, Kiernan (Kiernan , Tighearnán) is a rare gender-neutral first name. The forename Kiernan is habitual in Ireland, where it is a rare boy's name, Australia, where it is a very rare male name, and the United States, where it is a very rare unisex name. Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and Australia. More prevalently, Kiernan is the last name as well as the forename.
Kiernan is also a name for the fictitious and mythical characters: .