Last name Nicolaus (Nicolaus 
, Νικόλαος 
, Николаус 
, among others...) , around the world, is a common family name. The last name Nicolaus is habitual in Tanzania, where it is quite a common surname, Namibia, where it is quite a rare surname, and Paraguay. Measured by absolute frequency, it is the most numerous in Tanzania, Germany, and Indonesia. Also, Nicolaus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Nicolaus | Germany, Tanzania, Indonesia, United States, Sweden |
| Νικόλαος | Greece |
| Николаус | Kyrgyzstan, Kazakhstan, Ukraine, Russia |
| ניקולאוס | Israel |
Fjompenisse, Klaus, Laakkonen, Mikołaj, Mikuláš, Nicholaus, Nicoară, Nicola, Nicolae, Nicolai, Nicolau, Nicolás, Nicolò, Niels, Nigul, Nigulas, Niilo, Niko, Nikola, Nikolai, Nikolaj, Nikolaos, Nikolaus, Nikołaj, Nikólaos, Nils, Nings, Микола, Миколай, Мікалай, Никколо, Нико, Никола, Николай, Николаос, Николас, Ницолаус, Ніколас, Нільс, ניקולאי, ניקולאס, ניקולס, كلاوس, نيكولا, نيكولاس, نيكولاي, ნიკოლოზ, ニコ, 尼古拉斯, 尼柯, and 尼科
| catascepenus nicolaus (b. 1120) |
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| dresdensis nicolaus (b. 1350) |
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| martin nicolaus PL (b. 1870) |
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| max nicolaus (b. 1883) |
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| paul nicolaus German painter and graphic artist (1904-1945), DE (b. 1904) |
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| charlotte nicolaus (b. 1897) |
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kerstin nicolaus German politician, DE (b. 1961) |
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| rodolfo alessandro nicolaus Italian chemist (1920-2008), IT (b. 1920) |
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| egon karl nicolaus painter (1928-1988), DE (b. 1928) |
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| peter nicolaus (b. 1940) |
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| heinrich nicolaus b. 1955 in München; multimedia artist, DE (b. 1955) |
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| roland nicolaus DE (b. 1954) |
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| holger nicolaus DE (b. 1958) |
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| heidi marie nicolaus (born 1971) (b. 1971) |
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| hartwig waldemar nicolaus Peerage person ID=314400 |
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