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Last name Offen (Offen , 奥芬 , אופן ) , in all the world, is quite a rare cognomen. The last name Offen is habitual in Germany, where it is quite a rare surname, New Zealand, and Israel. Not in comparison with a country's population, the name is most common in Germany, the United States, and the United Kingdom. Much less frequently, Offen is the forename as well as the last name.