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Family name 이건 (Egan , 이건 , Eagan ) , all over the world, is a common surname. The cognomen 이건 is habitual in Ireland, where it is a common surname, Australia, where it is quite a common surname, and Jersey. In absolute terms, it is commonest in the United States, Ireland, and the United Kingdom. Much less frequently, 이건 is the forename as well as the last name.