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Family name Irēna (Ирена , Irēna ) , around the world, is a rare last name. The last name Irēna is habitual in Armenia, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Belarus. Measured by absolute frequency, the name is most common in Armenia, Bulgaria, and Russia. Much more prevalently, Irēna is the forename as well as the last name.