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