Cognomen Nicolaisen (Nicolaisen 
) , all over the world, is quite a rare family name. The cognomen Nicolaisen is characteristic of Denmark, where it is quite a common surname, Norway, and Malta, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in Denmark, Norway, and Germany.
| VARIANT | COUNTRY |
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| Nicolaisen | Denmark, United States, Germany, Norway, Sweden |
Nicolaysen, Nicolayssen, Nikolaisen, Nikolajsen, and Ницолаисен
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georg nicolaisen Swedish painter, SE (b. 1897) |
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| johan nicolaisen NO (b. 1847) |
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| karl kristian nicolaisen DK (b. 1883) |
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| peter nicolaisen (1894-1989), DK (b. 1894) |
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| wilhelm nicolaisen German university teacher (1901-1973), DE (b. 1901) |
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petra nicolaisen German politician, DE (b. 1965) |
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| svend nicolaisen DK (b. 1908) |
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| w. f. h. nicolaisen German folklorist (1927-2016), DE (b. 1927) |
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| harold nicolaisen Norwegian politician (b. 1929) |
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| johannes nicolaisen (b. 1921) |
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| peter nicolaisen German anglicist, specialist in literature and university teacher (1936–2013), DE (b. 1936) |
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| lise nicolaisen (b. 1926) |
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| ida nicolaisen Danish anthropologist, DK (b. 1940) |
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kaia wøien nicolaisen Norwegian biathlete, NO (b. 1990) |
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christian remo nicolaisen Norwegian ice hockey player, NO (b. 1992) |
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