Modern Blair Heavy Weight Tartan. Of territorial origin, from the Gaelic ‘Blar’, a moss, this name occurs in different parts of Scotland. One of the supporters of Sir William Wallace was Sir Bryce Blair of Blair, who was captured by the English at the close of the 13th century. Lands in Ayrshire came to the Blairs from Robert the Bruce. The Blairs of Balthyock were in Fife during the 13th century and it is from them that the Northern branch of the Blairs today claim descent. Other important branches are the families of Ardblair, Pittendreich and Glasclure.