Namesakes
Dutch Prime Ministers:
1 prime minister
Nicolaas Pierson 1897-1901 
Nobel Prize Winners:
1 physics
(physics) Nicolaas Bloembergen 1981
Notable Actors and Entertainers:
3 actors
Johannes Heesters (a.k.a. Nicolaas) 1903-2011
Jeroen van Koningsbrugge (a.k.a. Nicolaas) 1973-
Matthijs van de Sande Bakhuyzen (a.k.a. Nicolaas) 1988-
Notable Athletes:
1 boxing
(boxing) Nieky Holzken 1983-
Notable Musicians:
1 singer
Johannes Heesters (a.k.a. Nicolaas) 1903-2011
Notable Politicians and Statespeople:
1 politician
Eelco van Kleffens (a.k.a. Nicolaas) 1894-1983
Notable Scientists and Inventors:
1 physicist
Nicolaas Bloembergen 1920-2017
Olympic Medalists:
2 bronze
(bronze) Henk Bouwman (a.k.a. Nicolaas) 1948 field hockey
(bronze) Nico Landeweerd 1976 water polo
Other Royalty:
1 prince
Willem, Prince of Orange (a.k.a. Nicolaas) 1849-1879 Netherlands
Saints:
2 saints
Saint Nicolaas Pieck 1534-1572
Saint Nicolaas Poppel ?-1572