Perhaps Donal saw this thread: Lyr Add: Arranmore Boat Song where it says:

"(Words: Alfred P. Graves, transl. from the Irish; Air: Arran traditional; Source: J.N. Healy, Irish Ballads and Songs of the Sea)"

However, since it's generally undesirable to have multiple threads about a single song, I recommend that if anyone wants to discuss a Gaelic version, the add their comments to that thread, not this one.