The Royal Irish Regiment.
Yes, a large part of Ireland is now an independent Republic, but all of Ireland was part of the United Kingdom for quite a while and part of Ireland remains part of the United Kingdom, and many Irish soldiers have served, and continue to serve in the British Army. For this reason, there are a number of regiments of the British Army linked to Ireland that have the name 'Irish' in their name - the Irish Guards, and the Royal Irish being the two most famous of these.
The current Royal Irish Regiment was re-established in 1992 through the amalgamation of two regiments (the Royal Irish Rangers, and the Ulster Defence Regiment). It carries on a history dating back to 1688. It is officially based out of County Down in Northern Ireland. The regiment recruits in Northern Ireland and in Irish districts throughout the UK (it doesn't officially recruit in the Republic of Ireland for both legal and diplomatic reasons, but some recruits do come from there). Not all members of the Regiment are Irish, but most are at least of Irish descent.
Thanks for the great answer.
A large portion of the population of the South came from Northern Ireland. Their story is told in the book “Born Fighting” which I intend to read eventually.
My part of Florida, Walton County in the Panhandle was a little different in that it was settled by Highland Scots from the Western Islands.
I looked at a census of the Island of Colonsay taken in 1741 and the names were very close to the names of my classmates. The McDonalds, The McMillans, The Campbells, The Bells, The Blues, The McCleans, the McClouds, the McClellans etc. My Mother’s clan the McDuffies go back as far as history goes.