Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
DONELAN
As described in historical dictionaries
Patronymica Britannica (1860)
DONELAN. One of the most ancient families in Ireland, deriving from Cahal, 2nd son of Morough Molathan, King of Connaught, who died A.D. 701. One of his descendants built the castle of BallyDonelan, co. Galway. B.L.G.
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic