Hi, Erin: My line of MacKays start with Alexander M. Annie Ross, Dornoch, Sutherlandshire, SCT. They had a son, Peter(b.1801), who married Lilley Munro (b 1811) in Dornoch, SCT. Peter and Lillie came to Oxford, Zorra twp. about 1830. Their children were: Jane (1831) m. Wm. Fraser in 1847 Alexander (1832) m Jane Ross Catherine (1835) m John Gillespie Hugh (became a Doctor) (1836) m. Mary Peers Donald W. (1838) (was a blacksmith in Hickson, East Zorra, my gg grandfather)m. Agnes McKellar in 1862 John (1840) m Elizabeth Clark James Peter(1840) m Georgina McDonald Annie (1843) m. Alexander Level Murray in 1861 Elizabeth (1845)(also known as Bessie) m. Dr. Andrew MacKay (THIS MIGHT BE WHERE YOUR MACKAY/MACKAY MARRIAGE!) Robert P. (Rev.)(1847) m. Margaret Smith Mary (1849) m. John Macdonald.
I also have their childrens' names. For Elizabeth MacKay who married Dr. Andrew MacKay, their childrens' names are Fred, Albert, Lily, Dr. McKenzie, and Ethel. Any connections?