Casimir is a traditional Slavic name meaning "destroyer of peace" or "proclaimer of peace." It has roots in ancient Polish and Lithuanian history, where it was given to royals and saints. Casimir is a strong and regal name that exudes confidence and power. Those with the name Casimir are often seen as natural leaders with a strong sense of justice and fairness. Overall, Casimir is a timeless and classic name that carries a sense of history and nobility.