Namesakes
Casimir Pierre Périer
(m) 1777-1832 
French Presidents and Prime Ministers 1831-1832 (prime minister)
Charles Poulenard
(a.k.a. Casimir) (m) 1885-1958
Olympic Medalists 1912 4x400 m relay (silver)
Édouard Mortier, duc de Trévise
(a.k.a. Casimir) (m) 1768-1835
French Presidents and Prime Ministers 1834-1835 (prime minister)
Ernst Casimir of the Netherlands
(m) 1822
Other Royalty 1822 Netherlands (prince)
Jim Konstanty
(a.k.a. Casimir) (m) 1917-1976
Most Valuable Players 1950 baseball
John Casimir Ehrnrooth
(m) 1833-1913
Bulgarian Presidents and Prime Ministers 1881 (prime minister)
Kazimierz I the Restorer
(a.k.a. Casimir) (m) 1016-1058
Polish High Dukes and Kings 1040-1058
Kazimierz II the Just
(a.k.a. Casimir) (m) 1138-1194
Polish High Dukes and Kings 1177-1191; 1191-1194
Kazimierz III the Great
(a.k.a. Casimir) (m) 1310-1370
Polish High Dukes and Kings 1333-1370
Kazimierz IV
(a.k.a. Casimir) (m) 1427-1492
Polish High Dukes and Kings 1447-1492
Kazimierz of Poland
(a.k.a. Casimir) (m) 1458-1484
Saints
Kazimierz Pułaski
(a.k.a. Casimir) (m) 1745-1779
Notable Military Figures