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
Regular church services were held locally in Gaelic up until 1930, Today the generation which remembers native Gaelic being spoken is fast dying out, and any Gaelic speakers are likely to be either learners or incomers from Gaelic-speaking heartlands. To this day, though, "Church Gaelic" is based on the Perthshire Gaelic dialect. The first Gaelic Bible was translated by Balquhidder minister Robert Kirk.