Kasimir is a masculine given name of Polish origin, derived from the Slavic elements 'kaśne' meaning 'dazzling' and 'mir' meaning 'peace'. It was popular among the nobility in medieval Poland and has since been adopted by other countries, particularly Germany and Austria-Hungary. The name gained international recognition through its use by several historical figures, including Kaiser Wilhelm II of Germany who was named after his uncle, Tsar Alexander II of Russia. Despite its royal connections, Kasimir remains a relatively rare name outside of Eastern Europe. It has no regular equivalents in English but is sometimes shorten to 'Kas' or 'Kaz'.
"Kasimir has seen a resurgence in popularity in recent years, with the highest number of births recorded since 2021."