It's safe to know that we all know the song "Danny Boy".
It's become a sort of unofficial Irish National Anthem.
The tune "Londonderry Air" or "Derry Air" is indeed from Ireland.
But the lyrics were written by an Englishman from Portishead, a town on the Severn Estuary - about 12 miles from my native Bristol.
Here is the scoop. You may cut and paste this article whic is from the Bristol Evening Post