What does Kasimir mean?
Kasimir \k(a)-si-mir\ as a boys' name is pronounced KAZ-e-meer. It is of Slavic origin, and the meaning of Kasimir is "famous destroyer (of peace)". Variant of Casimir (Slavic) "bring peace". The name of the patron saint of Poland; also a favored name of Polish royalty. See also Casimir.
Kasimir is a rare first name for men. Kasimir is an equivalently rare last name too for both adults and children. (2000 U.S. Census)
Below is a graphed comparison of the popularity of the boy name Kasimir and affiliated names. The only popular variation form of Kasimir (#unlisted) is Casimir. These boy names were at the top of their popularity during the years 1910-1919 (usage of 0.529%) and are now significantly less popular, with Casimir becoming less stylish. (Top 1000 Birth Names Statistics, 2014)