Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
CREAGH
As described in historical dictionaries
Patronymica Britannica (1860)
CREAGH. This ancient Irish family claim descent from the famous Niall of the Nine Hostages, and they bore his name tmtil, in a campaign against the Danes, the head of this section having come off victorious, the citizens of Limerick placed green boughs in the headstalls of their deliverer's horses, and the chief himself received the complimentary title of O'Niall na Creavh, or " O'Niall of the Green Branch." The crest of the Creaghs of Ballyandrew, co. Cork, is a horse's head with a laurel branch in the headstall of the bridle. B.L.G.
Origin: Celtic
Region of origin: British Isles
Country of origin: Ireland
Religion of origin: Christian
Language of origin: Gaelic