CUSACK

CUSACK. There are two distinct origins assigned to this name. On one side it is asserted that the family spring from an illustrious race, the Sieurs de Cusac of Guienne in the IX. cent.; and on the other tliat they are of ancient Irish extraction, from Isog, foimder of the Clan Isog or Clan Cusack, and eleventh in descent from Olioll Olium, king of Mimster in 234. B.L.G.

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