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