Namesakes
Friedrich Karl of Prussia
(middle name Nikolaus) (m) 1828-1885 
Other Royalty 1828-1885 Prussia (prince)
Friedrich III
(middle name Nikolaus) (m) 1831-1888
Other Royalty 1888 German Empire; Prussia (emperor/king)
Nikolaus Otto
(m) 1832-1891
Notable Scientists and Inventors
Albrecht of Prussia
(middle name Nikolaus) (m) 1837-1906
Other Royalty 1837-1906 Prussia (prince)
Eugen of Sweden
(middle name Nikolaus) (m) 1865-1947
Other Royalty 1865-1947 Sweden (prince)
Nikolaus Gross
(m) 1898-1945
Saints
Nikolaus of Liechtenstein
(m) 1947-
Other Royalty 1947- Liechtenstein (prince)
Niki Lauda
(m) 1949-2019
Notable Athletes (driving)
Maximilian of Liechtenstein
(middle name Nikolaus) (m) 1969-
Other Royalty 1969- Liechtenstein (prince)
Nikolaus of Liechtenstein
(m) 2000-
Other Royalty 2000- Liechtenstein (prince)