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Last name Chasen (Chasen , 蔡森 ) , all around the world, is a rare cognomen. The cognomen Chasen is habitual in New Zealand, where it is a rare surname, the United States, and Australia, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in the United States, Thailand, and South Africa. Likewise, Chasen is the forename as well as the last name.