Namesakes
Karel I
(m) 1316-1378 
Bohemian Kings 1346-1378
Karel II
(m) 1685-1740
Bohemian Kings 1711-1740
Karel Albrecht
(m) 1697-1745
Bohemian Kings 1741-1743
Frederik of the Netherlands
(a.k.a. Karel) (m) 1797-1881
Other Royalty 1797-1881 Netherlands (prince)
Charles of Mount Argus
(a.k.a. Karel) (m) 1821-1893
Saints
Willem, Prince of Orange
(a.k.a. Karel) (m) 1840-1879
Other Royalty 1849-1879 Netherlands (prince)
Karel III
(m) 1887-1922
Bohemian Kings 1916-1918
Karel Čapek
(m) 1890-1938
Notable Writers
Karel Miljon
(m) 1903-1984
Olympic Medalists 1928 boxing (bronze)
Baudouin of Belgium
(a.k.a. Karel) (m) 1930-1993
Other Royalty 1951-1993 Belgium (king)
Karel Gott
(m) 1939-2019
Notable Musicians
Karel Kryl
(m) 1944-1994
Notable Musicians
Karel Lismont
(m) 1949-
Olympic Medalists 1972; 1976 marathon (silver/bronze)
Gabriel of Belgium
(a.k.a. Karel) (m) 2003-
Other Royalty 2003- Belgium (prince)