Meaning A boy's name of Slavic origin, it means "Sorrowful." Origin of Boleslaus Slavic +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Boleslaus Similar Names Brone TrasÃbulo Taqarius Tristian Trystan Aabid Badouagan Bedrosian Boghos Boriss Year by Year Popularity of Boleslaus