Cognomen Nikolaisen (Nikolaisen 
) , all over the world, is quite a rare family name. The last name Nikolaisen is characteristic of Northern Europe, particularly Norway, where it is quite a common surname, Denmark, where it is quite a rare surname, and Sweden, where it is a rare surname. Not in comparison with a country's population, this name is the most popular in Norway, the United States, and Denmark.
| VARIANT | COUNTRY |
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| Nikolaisen | Denmark, Canada, Norway, Sweden, United States |
Nicolaisen, Nicolaysen, Nicolayssen, Nikolajsen, Николайсен, and Ніколайсен
| mathilde nikolaisen Norwegian missionary (1876-1906) (b. 1876) |
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| jens daniel nikolaisen Norwegian missionary (1877-1958) (b. 1877) |
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| gulowna kristiane nikolaisen Norwegian missionary (1877-1954) (b. 1877) |
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karl nikolaisen (b. 1918) |
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ove nikolaisen Norwegian journalist (b. 1958) |
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elvira nikolaisen Norwegian singer-songwriter, NO (b. 1980) |
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hilma nikolaisen Norwegian musician (b. 1982) |
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| nils eivind nikolaisen Norwegian conductor (b. 1935) |
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| nils harald nikolaisen Norwegian contributing editor (b. 1949) |
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| tina nikolaisen Danish journalist (b. 1971) |
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| harald vaagaasar nikolaisen (b. 1967) |
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| emil nikolaisen Norwegian singer, NO (b. 1977) |
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| ivar nikolaisen Norwegian singer (b. 1978) |
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| nanett kvist nikolaisen researcher |
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| even s. nikolaisen researcher |
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