Meaning Keller is a Celtic name for a girl, it means faithful friend, one who sticks by through thick and thin. Origin of Keller Celtic , Irish Popular Middle Names Edwin, Gregory, Hawk, James, Ray, Scott, Theodore Pronunciation 🔊 Listen Keller KELl-er Similar Names Calin Kadin Marwin Blian Watford Buciac Brucey Diolmhain Blain Maheen Year by Year Popularity of Keller