Around the globe, Nilsen (Nilsen 
, นิล 
, Нильсен 
) is quite a rare gender-neutral first name. The first name Nilsen is habitual in Mauritius, where it is quite a rare boy's name, Paraguay, where it is quite a rare feminine name, and Thailand, where it is a rare epicene name. Measured by absolute frequency, it is the most numerous in Thailand, Brazil, and Paraguay. More prevalently, Nilsen is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Nilsen | Norway, Brazil, Sweden, United States, Denmark |
| นิล | Thailand |
| Нильсен | Kazakhstan, Russia, Ukraine |
| Нилсен | Russia |
Nilsen is also a name for the fictitious and mythical characters: .
| schjølberg nilsen (b. 1904) |
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| roy nilsen Norwegian resistance member (1916-1945), NO (b. 1916) |
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| nordal nilsen Righteous Among the Nations (b. 1922) |
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b. j. nilsen Swedish musician, SE (b. 1975) |
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stine nilsen Norwegian singer (b. 1975) |
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| finn lorens nilsen Norwegian writer (b. 1959) |
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| spencer nilsen American musician, US (b. 1961) |
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| gunn marit nilsen Norwegian politician (b. 1964) |
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| lill tove n nilsen researcher |
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| roy miodini nilsen researcher |
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| kirby t nilsen researcher (ORCID 0000-0002-9477-5549) |
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| stein tore nilsen researcher |
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| magne hesmyr nilsen association football player, NO (b. 1981) |
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| greger stolt nilsen (b. 1979) |
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| marte nilsen |
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