Namesakes
Alexander of the Netherlands
(middle name Constantijn) (m) 1818-1848 
Other Royalty 1818-1848 Netherlands (prince)
Antonie Kamerling
(middle name Constantijn) (m) 1966-2010
Notable Actors and Entertainers (actor)
Constantijn of the Netherlands
(m) 1969-
Other Royalty 1969- Netherlands (prince)
Constantijn Huygens
(m) 1596-1687
Notable Writers
Theo van Lynden van Sandenburg
(a.k.a. Constantijn) (m) 1826-1885
Dutch Prime Ministers 1879-1883