All over the world, Nielsen (Nielsen 
, Нільсен 
, Нильсен 
) is quite a rare epicene first name. The given name Nielsen is characteristic of Denmark, where it is quite a rare dominantly male, but infrequently feminine name, the Democratic Republic of the Congo, where it is a rare girly name, and Bolivia, where it is a rare male name. Not in comparison with a country's population, the name is most common in the Democratic Republic of the Congo, China, and Brazil. Predominantly, Nielsen is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Nielsen | Germany, Sweden, Norway, United States, Denmark |
| Нільсен | Ukraine |
| Нильсен | Kazakhstan, Russia, Ukraine |
| נילסן | Israel |
Nielsen is also a name for the fictitious and mythical characters: .
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zacharias nielsen FO (b. 1821) |
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oda nielsen Danish actress, DK (b. 1851) |
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godske nielsen NO (b. 1847) |
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| christen nielsen Norwegian politician (b. 1854) |
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| zacharias nielsen Danish politician, FO (b. 1868) |
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| roy j. nielsen American politician (1886-1964), US (b. 1886) |
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finn nielsen Danish actor, DK (b. 1937) |
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flemming chr. nielsen Danish translator, DK (b. 1943) |
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finn winge nielsen DK (b. 1935) |
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gifford nielsen American football player, US (b. 1954) |
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| hartvig nielsen Danish chess player (b. 1908) |
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finn årup nielsen Danish engineer and researcher, DK (b. 1970) |
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| lewis t. nielsen author of The mosquitoes of New Mexico (book) (b. 1920) |
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| palle nielsen Danish illustrator, DK (b. 1920) |
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| finn carsten nielsen DK (b. 1913) |
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