History of Scottish Gaelic
All surviving dialects are Highland and/or Hebridean dialects. Dialects of Lowland Gaelic have become defunct since the demise of Galwegian Gaelic, originally spoken in Galloway, which seems to have been the last Lowland dialect and which survived into the Modern Period. By the 18th century Lowland Gaelic had been largely replaced by Lowland Scots across much of Lowland Scotland. According to a reference in "The Carrick Covenanters " by James Crichton, the last place in the Lowlands where Scottish Gaelic was still spoken was the village of Barr in Carrick: only a few miles inland to the east of Girvan, but at one time very isolated. Crichton gives neither date nor details.
Canadian Gaelic
In Atlantic Canada today, there are currently approximately 2,000 speakers, mainly in Nova Scotia. In terms of the total number of speakers in the 2011 census, there were 7,195 total speakers of "Gaelic languages" in Canada, with 1,365 in Nova Scotia and Prince Edward Island where the responses mainly refer to Scottish Gaelic. The 2011 census also reported that over 300 residents of Nova Scotia and Prince Edward Island considered a Gaelic language to be their "mother tongue".