Meaning From Old English origin meaning 'rye field' it is an alternative spelling of Riley. Origin of Reilly English +-100%Zoom level changed to 1 Popular Middle Names Christopher, Isaiah, Joe, John, Michael, Richard, Sean Pronunciation 🔊 Listen Reilly RI-lee Similar Names Rhyley Reily Riley Ryley Rilley Rycroft Rygecroft Rhyland Rolan Leeland Year by Year Popularity of Reilly