Ken,
You ask whether widows reverted to their maiden names in Ireland. No they didn’t.
You also ask if the Free Church of Scotland existed in Ireland. The term Free Kirk wasn’t widely used, but in essence it existed in Ireland. The Presbyterian Church in Ireland went through more or less the same splits and reunifications as the Church of Scotland. So there were Burghers and Anti-Burghers, Auld Lichts and New Lichts, just as in Scotland. They weren’t quite as agitated about patronage as in Scotland because in general in Ireland the local landlord didn’t provide the Manse nor contribute to the Minister’s stipend in the Scottish fashion. But they took the other theological issues seriously and formed breakaway congregations just the same as in Scotland.
The breakaway churches were usually known as secession churches. Many eventually reunified with the mainstream Presbyterian church in Ireland (the equivalent of the Church of Scotland). Some became part of the United Presbyterian church with Ministers supplied from Scotland. Latterly the Free Kirk weren’t too keen on that arrangement (on cost grounds I think) and encouraged congreagtions in Ireland to merge with one of the local Presbyterian churches. There was a United Presbyterian church in Cullybackey, Co Antrim until the 1920s. It was known locally as the “Scots Kirk” to distinguish it from the Presbyterian and the Reformed Presbyterian churches in the town. When the Minister retired in the 1920 the Free Kirk declined to send another Minister and the whole congregation eventually switched lanes and became Methodist. Something I have not encountered before or since.
Here are some members of the United Free Church of Scotland in Co Antrim, in the 1911 census:
http://www.census.nationalarchives.ie/pages/1911/Antrim/Dundesert/Kilcross/108550/
You might be puzzled about the strength of these continuing links with Scotland, given that though their ancestors originated in Scotland these folk had been living in Ireland for 200 years or more. Samuel Thomson, a weaver poet who lived near Ballymena wrote this poem in the early 1800s entitled: “To Captain MacDougall at Castle Upton.”
I love my native land no doubt
Attached to her thro’ thick and thin
But tho’ I’m Irish all without
I’m every item Scotch within.
Thomson was one of a group of weaver poets, mostly self employed men who worked from home. They had strong connections with SW Scotland where their ancestors had mostly lived. Thomson was heavily influenced by Robert Burns, the master poet-ploughman, whom he met in Scotland at least once, and wrote in his vernacular style.