Modern Galbraith Medium Weight Tartan. The meaning of this name is accepted as being "the Briton's son", and it is believed that the original Galbraith may have been one of the Britons who settled among the Gaels. People of the name were in the Lennox district in the 13th century. In later times we find them in Edinburgh and other parts of Scotland. Robert Galbraith, who was rector of Spot in 1584, was a Lord of Session in 1587. In the Gaelic Highlands of Scotland the name was rendered as Mac a' Bhreatnaich. The various ways of spelling Galbraith included Cabreth, Calbreth, Galbreath, Galbrathe and Galbrayth.