As an Irish person, I think I can probably provide some ideas that could make Ireland a more interesting and immersive experience, including map changes, city name changes, and dynamic city names.
First of all, I think the most important change is the position of Dublin in the 600AD and 1700AD starts. Right now it’s positioned at the city name location of Loch Garman(Wexford), instead of Baile Átha Cliath (Dublin). This leads to the weird situation where if a city was founded 1 tile north, it’d also be called Dublin.
Furthermore; the city is named “Átha Cliath” (Dublin county), as opposed to “Baile Átha Cliath” (Dublin city, Baile is Irish for town). For the sake of consistency, I’d change the name to Baile Átha Cliath in the 600AD start, as have it named Átha Cliath would be like Paris being called Île de France.
Personally, having Dublin on the tile that currently occupies the cattle would make much more sense for me, however, the reason you moved Dublin one tile south is likely because settling the cattle would be impractical. As a result, I’d suggest moving the cattle one tile west and two tiles south, to represent the major cattle industry in cork and the south west of Ireland, which produces the largest amounts of cows today.
One other terrain change I’d suggest is adding a fish resource 2 tiles north of Baile Átha Cliath which would represent the fishing industry present in the north of Ireland. It would also be stolen by Edinburgh at some parts of the game, representing the lack of growth Ireland experienced in the industrial era, and the influence Scottish planters had on Northern Ireland.
Finally, I’d suggest adding one river just north in Dublin, to represent the river Liffey, which was the basis for the Viking settlement of Dublin, and the most significant river in Ireland today.
Okay, that’s enough for terrain changes, here are the dynamic city names I’d propose.
Béal Feirste: Béal Feirste (Ancient-Medieval), Belfast (Renaissance Ireland), Belfast (England)
Baile Átha Cliath: Glendalough (Pre-Medieval), Norse and Swedes (Dyflin), Duibhlinn (Medieval Ireland), Baile Átha Cliath (Renaissance Ireland), Dublin(Industrial-Global Ireland and England)
Essentially, Dublin didn’t exist as a major settlement in any sense until the Viking age, and Glendalough is a significant monastical settlement, that existed since the 6th century, making it much more appropriate than immediately having Dublin in the 600AD start.
Loch Garman: Loch Garman (Irish), Veisafjoror (Norse), Wexford (Industrial-Digital Irish and English)
Diare: Doire (Pre-Renaissance Ireland), Derry (Renaissance-Digital Ireland), Londonderry (England)
Derry definitely has an interesting history behind its name dispute, which still goes on today, with the city officially named Londonderry in the UK, and Derry in Ireland. Catholics in the city will always refer to it as Derry.
Sligeach: Sligigh (Pre-Renaissance Irish), Sligeach (Renaissance Irish), Sligo (England and Industrial-Digital Ireland)
Luimneach: Inis Sibhtonn (Pre-Medieval Ireland), Hlymrekr (Norse), Luimneach (Medieval-Renaissance Ireland), Limerick (Industrial-Digital Ireland and England)
Corcaigh: Corcaigh (Ancient-Renaissance Ireland), Cork (Industrial-Digital Ireland and England)
Gaillimh: Gaillimh (Classical-Renaissance Ireland), Gallive (Medieval England), Galway(Renaissance-Digital England and Industrial-Digital Ireland)
Tráigh Lí: Riasc (Ancient-Medieval Ireland), Tráigh Lí (Renaissance-Ireland), Tralee (English and Industrial-Digital Ireland)
Considering the town wasn’t founded until the 13th century, it could do with a name for an earlier Celtic settlement, and Riasc, a Kerry monastic site, makes the most sense for me.
Obviously, this is a lot of detail for the city names of a relatively small region of Ireland. They don’t all need to be implemented, but I’d at least suggest adding the dynamic names for Dublin since it’ll exist in most situations on the map.