"I am told my McCoy's are from the townland of Doogary. The records I found were for Corraghbrack which is next to Doogary. The townland your Jane McCoy is from, Killygavna, is also next to Corraghbrack"
I don't wish to contradict you but merely assist you, Killygavna/Killygavney isn't next to Corraghbrack. Corraghbrack is in Donagh Parish.
Killygavna/Killygavney and Doogary/Doogry are next to each other South West of Emyvale.
Killygavna/Killygavney is in Tedavnet Parish and actually in Tedavnet Village opposite the RC Church, as is Doogary/Doogry and there are at least 10 townlands in between Corrabrack and Doogary/Doogry.
Corrabrack is North West of Emyvale.
As the crow flies they are 5 miles apart! there is a lot of misinformation out there so one needs to be careful.
"With the close proximity and common given names I'd say the two families are related.".... they are not in close proximity! Sorry to disappoint you but they weren't neighbours!
See
www.logainm.ie for maps - one showing Tydavnet with Doogry, Killygavna/Killygavney, the other showing Corrabrack which is up the hills of North Monaghan