For Margaret Nairn, I have:
1756: Margaret Nairn, born April 22nd to Andrew Nairn (weaver) & Elspeth McQuare, Scotstarvit, Ceres, Fife.
It's frustrating not to be able to follow back from John, though.
There were always rumours in my own family that some McKenzies went to Canada, but I've never been able to confirm it.
Interesting that another branch of the family ended up in Perth, Aus, since my uncle's family is there too! Are there still descendents living there?