Namesakes
Notable Athletes:
1 driving
(driving) Niki Lauda 1949-2019 
Notable Scientists and Inventors:
1 inventor
Nikolaus Otto 1832-1891
Other Royalty:
6 princes, 1 emperor/king
Friedrich Karl of Prussia (a.k.a. Nikolaus) 1828-1885 Prussia
Albrecht of Prussia (a.k.a. Nikolaus) 1837-1906 Prussia
Eugen of Sweden (a.k.a. Nikolaus) 1865-1947 Sweden
Friedrich III (a.k.a. Nikolaus) 1888 German Empire; Prussia
Nikolaus of Liechtenstein 1947- Liechtenstein
Maximilian of Liechtenstein (a.k.a. Nikolaus) 1969- Liechtenstein
Nikolaus of Liechtenstein 2000- Liechtenstein
Saints:
1 blessed
Blessed Nikolaus Gross 1898-1945