So that's why the South Wind tune sounds so familiar to me when I hear it... (I heard it & was wondering about it just yesterday...) I have Archie Fisher's "Man with a Rhyme"...From those wonderful Folk Legacy booklets, Archie Fisher says this:
"Composed by Donal O'Sullivan from the translation of the song by "a native of Irrul, County Mayo, named Domhnall Meirgeach Mc Con Mara (Freckled Donal Macnamara)" and published in O'Sullivan's "Songs of the Irish"(Crown, New York, 1960)."