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Worldwide, Нільсен (Nielsen , Nilsen , Нільсен ) is quite a rare epicene given name. The forename Нільсен is habitual in Denmark, where it is quite a rare dominantly boy's, but seldom feminine name, Mauritius, where it is quite a rare boy's name, and Paraguay, where it is quite a rare girly name. Measured by absolute frequency, it is the most numerous in the Democratic Republic of the Congo, Brazil, and China. Predominantly, Нільсен is the last name as well as the forename.
Нільсен is also a name for the fictitious and mythical characters: .