Colm O Lochlainn gave the lyrics in his first ballad book, 1939: probably Patrick Joseph Kavanagh's source. This song was definitely written long before Kavanagh was born in 1904 and certainly not written by him. That's a nonsense statement.                                                

This is a Wexford song (see my post on a related thread on "Moneyhore", mentioned in the song, which is in County Wexford). Kavanagh was from Monaghan, and never wrote about anywhere in Ireland apart from the two areas in which he lived: Monaghan and Dublin: wise man Q.

(Kavanagh is of course author of "On Raglan Road", among many other things).