Sorry to disappoint but Healy attributes both the words and the tune of Kelly of Killanne to P J McCall. However Breatnac in Songs of the Gael 1915 states 'Mr McCall also kindly supplied me with the air. He is of the opinion that this version of the air has never before been published.' This could be taken several ways of course, but it could imply that the air was already known when he wrote the words.