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Cognomen Olen (Olen , Олен , Олень ) , across the world, is quite a rare surname. The family name Olen is habitual in Estonia, where it is quite a common surname, Papua New Guinea, where it is quite a rare surname, and Ukraine, where it is a rare surname. Measured by absolute frequency, this name is the most popular in the United States, Indonesia, and Ukraine. Likewise, Olen is the forename as well as the last name.