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Cognomen Ansen (Anse , Ansen , 安森 ) , throughout the world, is quite a common family name. The surname Ansen is characteristic of Japan, where it is quite a rare surname, Algeria, where it is a rare surname, and Denmark. Not in comparison with a country's population, this name is the most popular in Japan, Indonesia, and China. Likewise, Ansen is the forename as well as the last name.