Collins Encyclopedia of Scotland suggests that the name is a corruption of "Borgarey" (island of the broch), and while this is unlikely, and no broch is extant, the place name Brough, on West Burra lends some support to this case. However, the form used in the Orkneyinga Saga is "Barrey".
- Anderson, Joseph (Ed.) (1893) Orkneyinga Saga. Translated by Jón A. Hjaltalin & Gilbert Goudie. Edinburgh. James Thin and Mercat Press (1990 reprint). ISBN 0-901824-25-9
- Keay, J. & Keay, J. (1994) Collins Encyclopaedia of Scotland. London. HarperCollins.
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