Meaning A boy's name of Polish origin, it means "usurper's glory." Origin of Roscislaw Polish , Slavic +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Roscislaw Similar Names Radoslaw Ryzard Bogusz Bolek Dobroslaw Bohusz Budzisz Czeck Dobieslaw Tomislaw Year by Year Popularity of Roscislaw