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Surname Irenaeus (Ireneusz , Irenaeus , Ириней ) , across the world, is a widespread family name. The surname Irenaeus is habitual in Eastern Europe, particularly Poland, where it is a common surname, Hungary, where it is a rare surname, and Bulgaria. Not in comparison with a country's population, this name is the most popular in Poland, Nigeria, and China. Very seldom, Irenaeus is the forename as well as the last name.