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Last name 西森 (西森 , Nishimori , Sisson ) , all around the world, is a common surname. The last name 西森 is characteristic of Netherlands, where it is quite a rare surname, Belgium, and New Zealand. Not in comparison with a country's population, it is the most numerous in the United States, Germany, and the United Kingdom. Much less frequently, 西森 is the forename as well as the last name.