Bulgarian Presidents and Prime Ministers: 1 prime minister

      (prime minister) John Casimir Ehrnrooth   1881  

French Presidents and Prime Ministers: 2 prime ministers

      (prime minister) Casimir Pierre Périer   1831-1832  
      (prime minister) Édouard Mortier, duc de Trévise (a.k.a. Casimir)   1834-1835  

Polish High Dukes and Kings: 2 dukes, 2 kings

      Duke Kazimierz I the Restorer (a.k.a. Casimir)   1040-1058  
      Duke Kazimierz II the Just (a.k.a. Casimir)   1177-1191; 1191-1194  
      King Kazimierz III the Great (a.k.a. Casimir)   1333-1370  
      King Kazimierz IV (a.k.a. Casimir)   1447-1492  

Saints: 1 saint

      Saint Kazimierz of Poland (a.k.a. Casimir)   1458-1484