Sorry to revive a dormant thread but as a new visitor to the site, I'm ranging far and wide.

Any doubts as to the possibility of connecting Clann Eoghan to the South can be dismissed by reference to the Eoganachta tribes which ruled (as allowed!) much of Munster (especially parts of Kerry, Cork and Tipperary) from the early historical period in Ireland. Clann Eoghan could easily be a reference to those families and such references are common enough in 18th century poetry in Irish by Kerry poets.