Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
MAYO
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) The name of a county and town in Ireland, the plain near the water, from Moi or Moy, Gaelic, a plain, Moy, a river, and ai, a region or territory; the region or tract on the river Moy.
Patronymica Britannica (1860)
MAYO. See INIatthew and Mayow.
Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
Surname type: Location or geographical feature
Origin: English
Region of origin: British Isles
Country of origin: England
Religion of origin: Christian
Language of origin: English