Boy name origins & meanings Slavic : Peacemaker Boy name variations Casimir Casimeer Casmire Casmir Caz Kasimir Kasimiro Kazimierz Kazimir Cace Cacey Casey Cayce Caycey Kasey Casimer Family name origins & meanings Spanish and Portuguese : from the personal name Casimiro, Spanish and Portuguese equivalent of Casimir. See also Kazmierczak.