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All around the world, Eirin (Eirin , Eirín ) is a rare principally girly, but very infrequently boy's first name. The given name Eirin is characteristic of Norway, where it is quite a rare girly name, Australia, where it is a very rare girly name, and Indonesia. Measured by absolute frequency, this name is the most popular in Norway, Indonesia, and the United States. More prevalently, Eirin is the last name as well as the forename.