Hi
I think that would be Margaret Mary Hunter, she married Alexander Mckenzie/Mackenzie (the spelling was changed at some point) in Cambusnethan, they were my Great Grandparents, i have found quite a bit since that post and there certainly are lots of Hunters, Margaret had a lot of brothers and sisters John your father must have been a son of one of those, which one ?,let me know your email and i will let you look at our tree on Ancestry.co.uk it might help you.
As an addition one of my sons, his next child is going to have Hunter in the name to carry on the tradition.
Regards
Gordon Mackenzie