Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
SHEEHAN
As described in historical dictionaries
Patronymica Britannica (1860)
SHEEHAN. The O'Sheehans were a sept in the counties of Cork and Limerick. D'Alton.
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic