Cognomen Nikulainen (Nikulainen 
) , worldwide, is a rare surname. The last name Nikulainen is habitual in Northern Europe, particularly Finland, where it is quite a rare surname, Estonia, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname.
| VARIANT | COUNTRY |
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| Nikulainen | United Kingdom, Estonia, Finland, United States, Canada |
| aimo nikulainen Finnish radio journalist, FI (b. 1949) |
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| tomppa nikulainen Finnish musician, FI (b. 1976) |
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| veikko nikulainen researcher (ORCID 0000-0001-9453-4254) |
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| kari nikulainen FI |
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Mr, Emma, Eija, Eero, Eetu, Eeva, Veli, Ilpo, Iina, Osmo, Ulla, Marko, Mandi, Matti, Minna, Mikko, Antti, Anita, Katja, Kimmo, Paula, Pekka, Ella, Raimo, Timo, Taru, Ms, Ada, Aki, Kai, Kim, Pia, Roy, Teo, Tea, Esa, Mari, Mika, Miia, Sami, Arto, Asko, Aino, Kati, Pasi, Joni, Juho, Tero, and Ronja