Meaning Oisin is largely used in the English language, from Celtic origin meaning 'little deer'. Origin of Oisin Celtic , Irish +-100%Zoom level changed to 1 Popular Middle Names Pronunciation 🔊 Listen Oisin OSH-een Similar Names Olly Neil Osian Cillian Braden Bowen Codey CamRon Callam Ayden Year by Year Popularity of Oisin