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In all the world, Ollen (Ollen ) is a rare dominantly boy's, but uncommonly female given name. The given name Ollen is characteristic of South Africa, where it is a very rare gender-neutral name, the United States, where it is a very rare boy's name, and Philippines, where it is a very rare epicene name. Not in comparison with a country's population, it is the most numerous in the United States, South Africa, and India. Likewise, Ollen is the last name as well as the forename.