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Cognomen Deirdre (Deirdre , Diedre , Déirdre ) , in all the world, is a rare last name. The surname Deirdre is habitual in Ireland, where it is quite a rare surname, Spain, where it is a rare surname, and Australia, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Ireland, Spain, and Mexico. Much more prevalently, Deirdre is the forename as well as the last name.
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