Meaning A boy's name of Gaelic origin, it means "Mountain." Origin of Slevyn Gaelic , Irish +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Slevyn Similar Names Slaibhin Slaven Slavin Sleven Stiabhan Bealantin Gabhan Gearald Gille Raibeart Year by Year Popularity of Slevyn