Namesakes
Bohemian Kings:
4 kings
King Karel I 1346-1378 
King Karel II 1711-1740
King Karel Albrecht 1741-1743
King Karel III 1916-1918
Notable Actors and Entertainers:
1 actor
Herbert Lom (middle name Karel) 1917-2012
Notable Musicians:
1 musician, 1 singer
Karel Gott 1939-2019
Karel Kryl 1944-1994
Notable Writers:
1 author
Karel Čapek 1890-1938
Olympic Medalists:
1 bronze, 1 silver/bronze
(bronze) Karel Miljon 1928 boxing
(silver/bronze) Karel Lismont 1972; 1976 marathon
Other Royalty:
5 princes, 2 kings
Frederik of the Netherlands (middle name Karel) 1797-1881 Netherlands
Willem, Prince of Orange (middle name Karel) 1849-1879 Netherlands
Baudouin of Belgium (middle name Karel) 1869-1891 Belgium
Charles of Belgium (a.k.a. Karel) 1903-1983 Belgium
Leopold III (middle name Karel) 1934-1951 Belgium
Baudouin of Belgium (middle name Karel) 1951-1993 Belgium
Gabriel of Belgium (middle name Karel) 2003- Belgium
Saints:
1 saint
Saint Charles of Mount Argus (a.k.a. Karel) 1821-1893