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In the entire world, Dennison (Dennison , Деннисон ) is quite a rare masculine forename. The first name Dennison is characteristic of Grenada, where it is quite a common boy's name, Philippines, where it is a rare male name, and the Dominican Republic. Not in comparison with a country's population, it is the most numerous in the United States, Philippines, and Brazil. More prevalently, Dennison is the last name as well as the forename.