"Variant of Casimir"
The name Casimer is commonly a male name from the "Slavic" origin.
Casimer is a variant spelling of Casimir, the English form of the Polish name Kazimierz, which Latinized sources render as Casimirus. The name was carried by Polish rulers including Casimir III the Great and by the 15th-century Polish prince known as Saint Casimir, which helped spread the Latinized forms across Europe. Casimer belongs to the same family of spellings as Casimir and Kasimir and is not a separate coinage.
Casimir means "Peace is announced.".
The pronunciation of Casimer is KAZ-ih-mer.
