From a Polish royal name, and saint's name, of Slavic origin, meaning "proclamation of peace".
- A male given name.
- 1992 Thomas Keneally, Woman of the Inner Sea, Plume (1994), ISBN 0452271770, 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?