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Family name Brennen (Brennen ) , all around the world, is quite a rare last name. The family name Brennen is habitual in Bahamas, where it is quite a common surname, Isle of Man, where it is quite a rare surname, and Malaysia, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in the United States, Malaysia, and Bahamas. Also, Brennen is the forename as well as the last name.