Miecislaus, derived from the Slavic elements 'miéc' meaning 'kind' and '-slav' meaning 'glory', is a masculine given name of Slavic origin. It is a patronymic variant of Mieczysław, which means 'more glorious than the sword'. The name Miecislaus is associated with several historical figures, most notably Miecisław II the Fat, Duke of Poland in the 12th century. It was also borne by several members of the Piast dynasty that ruled over Poland and other Slavic territories during the Middle Ages.
"Between 1920 and present, there were five babies named Mićysław."