Namesakes
Dutch Prime Ministers:
1 prime minister
Theo van Lynden van Sandenburg (a.k.a. Constantijn) 1879-1883 
Notable Actors and Entertainers:
1 actor
Antonie Kamerling (a.k.a. Constantijn) 1966-2010
Notable Writers:
1 poet
Constantijn Huygens 1596-1687
Other Royalty:
2 princes
Alexander of the Netherlands (a.k.a. Constantijn) 1818-1848 Netherlands
Constantijn of the Netherlands 1969- Netherlands