Ó Corráin, Donnchadh and Fidelma Maguire, Irish Names, 2nd edition (Dublin, Ireland: Lilliput Press, 1990).
Tangwystyl verch Morgant Glasvryn, "Feminine Names from the Index to O'Brien's 'Corpus Genealogiarum Hiberniae'" (http://www.panix.com/~mittle/names/tangwystyl/obrien/).
Irish-English English-Irish Easy Reference Dictionary, "new edition" (Boulder, Colorado: Roberts Rinehart Publishers, 1998).