Found some more. This from a 1996 book called "Irish Ballads", various authors, published by Gill & Macmillan. The chapter in the book on "Caggigdhoun" was written by John A. Murphy, Emeritus Prof. of History, University College, Cork.

The river Owenabue [Owenboy - on OS maps]runs into the sea at Crosshaven, just south of Cork City. Carrigdhoun and Ardnalee are the "author's inventions, though they may correspond to particular features of the landscape". Denny Lane, whom Prof. Murphy presumes to be the writer, was once incarcerated in Cork Gaol, presumably for political activity. An obit. described his works as "entirely fugutive" (ephemeral). "What a rich irony! If he had written a shelf of scholarly tomes, he would not be as well, and certainly not as fondly, remembered".