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.
Lochearnhead
By 1837, the New Statistical Account tells us that in the area, "Gaelic is the language generally spoken, but it has been rather losing ground within the last forty years". At the time of the 1881 Census, when a question about Gaelic was included for the first time, there were still more than 70% in the parish with Gaelic as their first language, and even some with Gaelic as their only language.