Cognomen イーガン (Egan 
, Eagan , イーガン) , in the entire world, is a common surname. The surname イーガン 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. Very seldom, イーガン is the forename as well as the last name.