Iain Fraoch MacDonald (died 1368) also known as John og of the HeatherMacDonald, A (1900). The Clan Donald. Vol. 2. p. 190 was a younger son of both Angus Og MacDonald of Islay and a daughter of Dugal MacEanruig,Donaldson, M.E.M. (2nd ed., 1923) Wanderings in the Western Highlands and Islands p. 289 n.7Gregory, Donald (1836) History of the Western Highlands and Isles of Scotland pp. 66-67 additionally he was also the founder of Clan MacDonald of Glencoe.
"Fraoch" is a nickname which means "the snarling" in the Scottish Gaelic language, although it usually means heatherhttp://www.smo.uhi.ac.uk/gaidhlig/faclair/sbg/lorg.php?facal=fraoch&seorsa=Gaidhlig&tairg=Lorg&eis_saor=on
Citations
References MacDonald, A (1896). The Clan Donald. Vol. 1. Inverness: The Northern Counties Publishing Company. Macphail, JRN, ed. (1914). Highland Papers. Publications of the Scottish History Society. Vol. 1. p. 23 Edinburgh: Scottish History Society. Macbain, A; Kennedy, J, eds. (1894). Reliquiæ Celticæ: Texts, Papers and Studies in Gaelic Literature and Philology, Left by the Late Rev. Alexander Cameron, LL.D. Vol. 2. p. 159 Inverness: The Northern Counties Newspaper and Printing and Publishing Company.
External links entry from peerage website