'At the back of the damp place'. Or cùil bhraonach 'damp corner, oozy nook' (Watson 1926, 189).
'It had of old a much more extensive application than it now has. It embraced the whole of the lands beyond the burn which skirts the wood and forms, above and below Rose Bridge, the boundary between Teanacoil, Bruiach and the manor farm, runs on below the bridge near the gate entering the castle grounds, passes on to near old Dounie, and then joins the main river. To the north and west of that burn lie the old lands of (Culburnie)..... I take it that the old lands of Culburnie embraced Culburnie Moor, Fanellan, Mains of Castle Downie, with the old Church-lands which formed a part of these.' MacDonald 1914, 448. In 1509 Beaufort castle is described as being on the lands of Kilbirny (RMS ii no. 3531).