Meaning Largely used in Scottish languages, Niall means 'champion', 'cloud' or 'passionate'. Origin of Niall Celtic , Irish +-100%Zoom level changed to 1 Popular Middle Names Thomas, Emerson, Jacob, Nicolas Pronunciation 🔊 Listen Niall NAYL Similar Names Neel Neil Nial Nijel Nygel Nyle Nile Nil Arjun Yasin Year by Year Popularity of Niall