The name is a Gaelic rendition of Old Norse lang[1] "long" and vatn, meaning "lake".
According to Sinclair (1890), John Macaulay, known as Iain Ruadh MacDhughaill, "was celebrated as a hunter.
He was drowned in Loch Langabhat whilst swimming to an Island in the middle of that lake, an t-Eilaln Dubh.
A large stone marks the spot on which his body was laid after it was taken out of the water.
His bereaved mother used to visit this spot on almost every Wednesday of the year.