English form of the Polish name
Kazimierz, derived from the Slavic element
kaziti "to destroy" combined with
mirŭ "peace, world". Four kings of Poland have borne this name, including Casimir III the Great, who greatly strengthened the Polish state in the 14th century. It was also borne
Saint Casimir, a 15th-century Polish prince and a patron saint of Poland and Lithuania. The name was imported into Western Europe via Germany, where it was borne by some royalty.