It seems that there is a connection but I have yet to map it out... I am told my McCoy's are from the townland of Doogary. The records I found were for Corraghbrack which is next to Doogary. I found George McCoy married to Mary Neely, their children were Robert b.1842, Margaret b.1843, William b.1844, Mary Jane b.1848. (Whom I believe to be my GGGM)
The townland your Jane McCoy is from, Killygavna, is also next to Corraghbrack. There is a William McCoy and family living there on the 1911 census. Do you know if this is your line?
With the close proximity and common given names I'd say the two families are related. Perhaps Jane and George were siblings or cousins.
Where is Lennaught?
Thanks for the help.
Rory