From the MacDermid (McDermid/MacDiarmid) family history my mother and I have compiled: "Duncan MacDiarmid was born in 1757 at Ballemore (a croft) on the north side of LochTay in Perthshire,Scotland...." Duncan was my great-great-great-great grandfather. Also, "Duncan MacDiarmid 'was a stalwart U.E. Loyalist and a prominent member of the Church of Scotland; died loved and honored in his 90th year, April 15, 1847.'"
I have a bit more information, including the fact that his father was Hugh. Another MacDermid doing research found in the archives in Edinburgh a document among "Petitions to the Earl of Breadalbane." One entry dated 1793 read, "Widow MacDiarmid of Ballemore. For 80 years her husband and his father had had the land. She is now destitute. Her eldest son helps." My mother's notation was that this would be a petition asking the Earl of Breadalbane for aid. My mother also noted that Hugh, father of Duncan, lived on Ballemore in 1769 (according to the book Survey of Lochtayside in 1769; I have a copy of it) and my mother concluded that the widow referred to would be Hugh's wife and that the eldest son referred to was Duncan.
In 1799 Duncan led a group from that vicinity, Loch Tay, sailing in "The Pearl" to America. Originally they settled in upstate New York, but yearned for a church in which they spoke and read Scriptures in the Scottish Gaelic language, so they moved northward and settled in southern Ontario.