Seeing as you mentioned "Rocky Road to Dublin" I have some questions about the song.

Years ago when my Father was a boy, my Great Grandmother used to sing the song to him.

The way that he remembers it is...

They've banished all the hogs on the rocky road to Dublin
Garra ga dira thum
Gara ga dira thagga dee
Garra ga dira thum

The questions are...
Does anyone have any more of this version?
Are they nonsense words or is it meant to be Gaelic?
Does anyone know versions other than the one that The Dubliners sing?

Thanks, Bert.