Hello, I found this info in a few spots; I'll do my best to link them here. Please note that I am just researching the MacKay name and this is the information I have found on the net. For the MacKays out there, I meant no offence

MacKays as MacDonald sept:

http://www.chebucto.ns.ca/Heritage/F...ns/MacKay.html
http://www.chebucto.ns.ca/Heritage/F...ald_Isles.html
http://www.electricscotland.com/webclans/m/mackay3.htm

MacKay as MacNaughton sept:
http://www.electricscotland.com/webclans/septs.htm