Sorry for the delay in posting a reply...although I have the right box ticked, I don't recall getting a notice that you replied to my email.
I made that posting many years ago when I was pursuing the line that a bunch of Norvals in Glasgow where my line of Norvals.Since then, I have made great strides and have discovered that my line of Norvals were from Fifeshire (Thornton, Markinch) and probably extend back to a "nest of Norvals" in Aberdeenshire.
The Glasgow Norvals could well have come from this line too but I have not been able to connect them.
Sorry, I am not much help...I do have a John Norval b. 1799 in Thornton Markinch, married a Mary Hogg Johnston and lived on the Isle of Skye.So far, I have found only one son for him, Joseph who apparently died young (circa 1834) and no other children.The only connection with your James might be that John Norval was a carpenter and if he had other children....but this I do not know.