I've never come across a Gaelic version of the song either. I assume that the enquirer is asking about the song by Ethna Carbery, not the older ballad of '98 that inspired it? I've never heard a Gaelic version of that one either! Carbery's song was certainly written in English, published in 1902.

Bobby Sands wrote a long poem about McCorley, in English, but he did use the Gaelic form of his name.