Meaning Inogen is probably a variation of the name Imogen. It means 'daughter', 'girl' or 'innocnce'. Origin of Inogen Celtic , Irish Popular Middle Names Pronunciation 🔊 Listen Inogen IHN-ah-gahn Similar Names Hujayrah Kakalina Travine Fatima Ismelda Ildegunda Idella Indeg Fedelm Findabair Year by Year Popularity of Inogen