The Irish Language Song "Trasna na dTonnta" mentioned earlier is a modern one. It is given in a song book"Amhránleabhar Ógra Éireann" produced by the Irish Christian Brothers in 1950 with the following ascriptions:
Fonn (air): Westring Home
Tomás Tóibín, d'aistrigh (Translation by Thomas Tobin).

It's followed, incidentally, by "Ag Triall ar Inis Thiar" (Heading for Inishere) which is set to the air of "The Road to the Isles". There were several waves of such adaptations during the attempted revival of Irish.

Regards