Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
EWAN
As described in historical dictionaries
Patronymica Britannica (1860)
MAC EWAN. (ClanEoghannaHoitreic, or clan Ewen of Otter, whose castle was on the coast of Lochfiue.) Descended from a common ancestor with the Maclachlaus. Skene. MACEY. 1 . From Macel near Avranches in Normandj\ 2. Maci is also an old Norman form of Matthew.
Surname type: From given name or forename
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic