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Worldwide, Eir (Eir , Heir , Eigre ) is a rare epicene first name. The first name Eir is habitual in Greece, where it is a rare principally boy's, but very seldom girly name, Sweden, where it is a rare feminine name, and Finland. Measured by absolute frequency, the name is most common in Greece, Sweden, and China. More frequently, Eir is the last name as well as the forename.
Eir is also a name for the fictitious and mythical characters: Eir , the fictional character from 2013 film 'Thor: The Dark World' and Heir of Slytherin .