DILLON

From the Welsh Dillyn, handsome, gallant, brave, fine.

Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.

DILLON. The common ancestor of the noble Dillons of Ii'eland was Henry Dillon, who settled in that country in the year 1185. King John, while Earl of Mortain, gave him immense tracts of laud about Drumrany, wliich were afterwards collectiA'ely known as Dillon's country. See Geneal. Hist, of the Fam. of Brabazon, p. 17. Nothing seems to be known of the ancestors of this personage or of the origin of the name.

Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.