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Family name כאהן (Cahen , כאהן ) , around the world, is quite a rare last name. The last name כאהן is characteristic of Luxembourg, where it is quite a rare surname, France, and Israel, where it is a rare surname. Not in comparison with a country's population, it is commonest in France, the United States, and Brazil. Much less frequently, כאהן is the forename as well as the last name.