Namesakes
Notable Actors and Entertainers:
2 actors
David Janssen 1931-1980 
Famke Janssen 1964-
Notable Athletes:
2 soccer
(soccer) Vincent Janssen 1994-
(soccer) Dominique Janssen 1995-
Saints:
2 saints
Saint Nicasius Janssen of Heeze 1522-1572
Saint Arnold Janssen 1837-1909