or Erin is Celtic; from Eri or Iar (western). Lloyd (State Worthies, article “Grandison”), with a gravity which cannot but excite laughter, says the island is called the land of Ire because of the broils there, which have extended over four hundred years. Wormius derives the word from the Runic Yr, a bow. (See below.)
By Apuleius, “Hibernia,” which is Iernia, a corruption of Iar-inni-a. By Juvenal (ii. 260) “Juverna” or “Juberna,” the same as Ierna or Iernia. By Claudian “Ouernia,” the same.
By moderns “Ireland,” which is Iar-en-land (land of the west).
“He had read in former times of a Going Fire, called `Ignis Fatuus,' the fire of destiny; by some, `Will with the Wisp,' or `Jack with the Lantern;' and likewise, by some simple country people. `The Fair Maid of Ireland,' which used to lead wandering traveliers out of their way.”
—The Seven Champions of Christendom, i. 7.
The same person founded an “Exegetical Professorship” of 800 a year.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894