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