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Family name Erm (Erm , Eerm , Эрм ) , in the entire world, is quite a rare cognomen. The surname Erm is habitual in Estonia, where it is quite a common surname, United Arab Emirates, where it is a rare surname, and Hungary. Measured by absolute frequency, it is the most numerous in Estonia, Indonesia, and Germany. Very seldom, Erm is the forename as well as the last name.