The English names had me fooled for awhile too but after Cromwell's invasion land was given to anyone for favours for the Queens/Kings etc. (90% of the land was in British hands, most by absentee landlords and run by estate agents. The British farmers and in the north the Scots were brought over by 'plantation' methods, people not trees. The british government of the day wanted good Protestant farmers 1) to outnumber catholics and 2)they were considered better farmers. At one point the Church of Ireland was the dominant church with a few small catholic chapels. It was illegal for an irish child to be educated. Efforts were made
to educate the irish kids and that is where the term 'hedge schools' came from.
That how all the Mc's and english names got to Ireland. When land was repatriated, often protestant farmers converted to keep the farms they had in their families for 200 years.
Many of the very staunch Protestants and Methodists went to Canada at this time.
The Protestant records for Ireland are at the Church of Ireland representative library and in the early years Methodist, Presbyterian had records in the Church of Ireland
registries. You can check their lists to see if your parish records survived.