Meaning A boy's name of Polish origin, it means "usurper's glory." Origin of Roscislaw Polish , Slavic Popular Middle Names Pronunciation 🔊 Listen Roscislaw Similar Names Rufin Bogumil Bolek Dionizy Lucjusz Metody Miroslaw Pawl Slawomir Wlodzimierz Year by Year Popularity of Roscislaw