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In all the world, Neilsen (Neilsen ) is a rare mostly masculine, but seldom feminine first name. The first name Neilsen is characteristic of Philippines, where it is a very rare epicene name, Indonesia, where it is a very rare boy's name, and the United States, where it is a very rare primarily male, but scarcely female name. More frequently, Neilsen is the last name as well as the forename.
Neilsen is also a name for the fictitious and mythical characters: .