Meaning A boy's name of Gaelic origin, it means "Southerner." Origin of Deasach Gaelic , Irish +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Deasach Similar Names Dacy Donald Peadar Bealantin Gabhan Gearald Gille Mungan Raibeart Stiabhan Year by Year Popularity of Deasach