Casimir m
Anglicized spelling of Polish Kazimierz, derived from kazić to destroy + the Old Slavonic element meri great, famous (later taken as the medieval and modern word mir peace or world). This was a traditional name of Polish kings in the Middle Ages. Casimir I succeeded in reuniting Polish lands and restoring Polish power. Casimir III, ‘the Great’ (1310–70), king from 1333 to 1370, was an effective and able ruler, and also a just and humane one, who presided over a golden age in Polish history. St Casimir (1458–83) was a son of King Casimir IV; his father wished him to seize the crown of Hungary, but instead he retired from the world, eventually dying of consumption.
First names dictionary. 2012.