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Surname Ieronim (Ieronim , Иероним ) , throughout the world, is a rare cognomen. The family name Ieronim is habitual in Romania, where it is a rare surname, Spain, where it is a very rare surname, and Georgia. Not in comparison with a country's population, it is commonest in Romania, Spain, and Mexico. More frequently, Ieronim is the forename as well as the last name.