"FOGO, a parish in the central part of the Merse district of Berwickshire. It contains a hamlet or small kirktown of its own name, on the Blackadder, 3½ miles south-south-west of Dunse, which is the post-town. It is bounded by Edrom, Swinton, Eccles, Greenlaw, and Polwarth ... Its basin is a sort of huge furrow, seldom closing in upon the river in steepness of banks, yet forming a hollow between parallel ranges of low heights; and having the church immediately on the margin of the stream, it suggested to the early colonists the name Fog-hou, which is the ancient and legitimate form of the word Fogo, and means the foggage pit, den, or hollow."
From the Imperial Gazetteer of Scotland
, edited by John Marius Wilson, 1868.