Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
OQUIN
As described in historical dictionaries
Patronymica Britannica (1860)
OQUIN. " This ancient sept is recognised in the native annals, from the earliest date of surnames ; those of Ulster commemorate, among the heroes who fell at Clontarf in lOU, Neill O'Quin. Widely spreading over Ireland, this family held territory in Limerick, Clare, Longford, Westmeath, and Derry." D'Alton.