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Last name Ärm (Erm , Ärm ) , worldwide, is quite a rare surname. The cognomen Ärm is characteristic of Estonia, where it is quite a common surname, United Arab Emirates, where it is a rare surname, and Hungary. Not in comparison with a country's population, the name is most common in Estonia, Indonesia, and Germany. Very seldom, Ärm is the forename as well as the last name.