Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
MARES
As described in historical dictionaries
Patronymica Britannica (1860)
MARES. Scot, from Fr. marais. A marsh.
Origin: Iberian
Region of origin: Europe
Country of origin: Spain
Religion of origin: Christian
Language of origin: Spanish