Good day from Canada,
Sorry for the delay in sending these comments, in case they might at least be of interest if not any use, but I just came across the question you posted about the Nowlans in Ireland. My third great-grandfather was also named John Nowlan b.1796 and baptised in what is recorded as County Armagh. He was married to a Mary (Fitzpatrick) b.1799 from Barenasltown? Ireland. All I understood was that his father was also named John Nowlan (possibly spelt at one time Nowland). Their son, my second great-grandfather was James Nowlan born August 21, 1821 in County Cork. He immigrated to Canada in 1847 and continued working as a farmer through his life raising several generations of James and John Nolans, down to and including me. For some unknown reason, between the time he immigrated and the time he died (1911), he dropped the "w" from his surname so from then on the family name became Nolan instead of the original Nowlan it was in Ireland. I just found it a coincidence that they were Johns and James Nowlan, about the same time, farmers and Catholics and that John's wife was Mary. How certain I can be that the Fitzpatrick is correct I don't know for sure. There is also mention of a Mary Donaly in the records of James immediate ancestors (grandmother?). I'm not sure and haven't tried yet to make the connection. I also wondered why John in 1796 would have been baptized in Armagh, which according to my Father-in-law, who was born and raised in Armagh, was predominantly protestant Irish, and we always understood that the Nowlans originated in County Cork. Is there a possible connection? I don't know but there's my history for what it's worth, with my best wishes for your continued happy hunting and enjoyment trying to sort it all out.