Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
EGAN
As described in historical dictionaries
Patronymica Britannica (1860)
EGAN. . Tlie cineal JEoghain, were the ' genus' or progeny of Eoglian, a great Irish chief contemporary with St. Patrick. The name is anglicised to Owen and Eugene. O'Donovan in Irish Penny .Journ. p. 327. Gaelic, e)ffi?i, force, violence ; hence strong-handed, active. Arthur.
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic