Dear Canada Girl,
You write of an Eliza Jane Harrison who married, possibly in Cootehill, Cavan. I am told that marriages most often took place in the home parish of the bride. If true in this case, we are looking at a Harrison family of Cootehill.
There were Harrisons of Cootehill, County Cavan, who went to Canada. Two trips. The first was James Harrison of Cootehill (born about 1770) and his wife Frances who took all but [one] of their children with them to Canada in, best guess, 1820. Frances died aboard ship (1820) and the father about two months later or in the 1820s anyway. Children were all on Wolfe Island, Canada at this point. The late couple had left behind in Cootehill their son Edward Harrison who was doing his apprenticeship--a legal agreement--in weaving. Edward--in no hurry to join his family--married Rachel Wilson, had a first son James named for the baby's paternal grandfather, and then the family of three went to Canada in 1832, specifically Caledon, Peek County; is that Ontario? Now, did these Harrisons (either James or Edward) leave behind a brother in Cootehill? I don't know. James had two siblings in County Monaghan, but Edward could have. I don't know of any other sibling for either.
Mine were a Presbyterian family. James Harrison had a known bro and a known sister. The brother was Hugh Harrison of Ballybay, County Monaghan (born 1760). Their sister was Isabella Harrison White. (Both Isabella and Hugh married Whites, also a brother Joseph White and sister.) These three Harrisons--James, Hugh, and Isabella--trace back to John Harrison the Elder of Castleblayney, who was there in 1663 and died there in 1703. This John was probably born in England, as six branches of our 9 branch family have the same oral tale, that the first Harrison in Ireland was born in England, came to Ireland under Cromwell. The end of short oral tale.
If you think your Eliza Jane Harrison was related to these Cootehill Harrisons (of mine), I would be interested in knowing, please. Thank you. I do not see McKeogh in my tree, but do see McGeoh in Armagh and McKeown, and MCCoy, probably not what you are seeking. Which spellings have you seen for the name you have? Thank you. We have three to four Eliza Janes in our Harrison family. But your Eliza Jane Harrison might have been named for her mother's family, given the Irish naming tradition followed by my Harrisons.
In sum, my family had a James Harrison of Cootehill and his family were of Cootehill no earlier than he himself and my guess is he was born over in County Monaghan in about 1770. The Canadian descendants of James Harrison (but not by his son Edward) called their hometown "Monaghan Goire" which means near Monaghan, in this case near the county of Monaghan. One descendant searched maps for Monaghan Goire, so I write here that it was Cootehill, County Cavan, where all of James's children were born. I hope this is your (Presbyterian) family, otherwise, I have written off topic.
(The research on the Cootehill Harrisons, was done by the late Elizabeth Chadwick Stanford. The research on Edward was done by S, living.) Good luck with your Harrison ancestor, Eliza Jane Harrison.
Polly LYNN