This is all great information for me to thoroughly investigate!! Thank you!
I can see that the James dates don't line up, but perhaps John Kirk, the baker, had a
brother, James. I estimate that John Kirk was probably born about 1757 (since he married in 1787). I estimate my James Kirk's father should have been born about 1760-- close enough age for brothers. Just a thought.
I re-read the information passed on through old letters that I have and it clearly states my great grandfather Dr. William Kirk said,
"that his uncle had fun with David Livingston on his first expedition up the Zambian River." In another old newspaper article in which he was interviewed, Dr. Kirk stated he
has the surgical instruments of an Irish Ancestor who who was a surgeon at the Battle of Waterloo and had a relative that was on the first English boat to sail up the Congo River in Africa. So I am convinced there must be a connection to Sir John Kirk's family--and am determined to find it!!

Also, interesting to note, John Kirk b. apx. 1757 (married to Margaret Toddie) named their children
John, Alexander, Elizabeth, James and Isebela.
Their son, Reec (Rev) John Kirk b. 1795 (married to Christian Guthrie Carnegie) also named their children,
John, Alexander, Elizabeth and James--guess they didn't have the 5th child to name after Isebela. Was this a common thing to do back then?
My search is now finding the
parents/brothers of John Kirk, the baker--b. apx. 1757, married to Margaret Toddie. Thanks for any help.