Meaning A boy's name of Dutch origin, it means "Merciful." Origin of Clementius Dutch +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Clementius Similar Names Bram Dirck Abdur Rahman Ambakisye Abdur Raheem Abdul Latif Cecilius Claudios Clemente Cliamain Year by Year Popularity of Clementius