Someone had asked if there was a book that gave the variations and nicknames for Irish first names. Because other Irish family researchers might also be interested in the topic, I am posting a link to an online version of a booklet on the subject matter. The title is not listed in Live-brary.com (Public Libraries of Suffolk County) catalog; therefore the online version is my suggestion for viewing it.
Wight, Judith Eccles. A Rose by any Other Name. Provo, Utah: J. E. Wight, 1985