I wouldn't regard this as evidence but I have heard remarks that would support the info from Ard Mhacha. Many years ago I heard it referred to as a Free Staters' song. The reference was not to place of residence but to political outlook. In other words a song for the pro-Treaty side and their descendants, both political and biological. Yes, I know they are often the same thing.

I have seldom, if ever, heard the song performed by groups who include a lot of Repubican stuff in their repertoire and I suspect those who do are unaware of the songs origins.