Meaning Originally a surname based on a place name, it's English meaning is 'rye field'. It's Celtic meaning is 'a valiant man'. Origin of Reily Celtic , English Popular Middle Names Pronunciation 🔊 Listen Reily RAYL-iy Similar Names Rumford Ruhleah Claytin Tamunokuro Triston Taylon Cormic Masiah Dud Bradig Year by Year Popularity of Reily