From a Polish royal name and saint's name Kazimierz, of Slavic origin, meaning "proclamation of peace".
- A male given name from Polish.
- 1992 Thomas Keneally, Woman of the Inner Sea, Plume (1994), →ISBN, page 19:
- - Babushka wants you to call the poor little bugger Casimir after her uncle in the Resistance. Can you imagine what would happen in any schoolyard to a kid with a name like Casimir?