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Family name Hren (Hren ) , throughout the world, is quite a rare last name. The surname Hren is characteristic of Southern Europe, particularly Slovenia, where it is quite a common surname, Croatia, and Bosnia and Herzegovina, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Croatia, Slovenia, and the United States. Much less frequently, Hren is the forename as well as the last name.