Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
ABERNETHY
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Gaelic and Celtic. Local) From a town in Strathern, Scotland, on the river Tay; derived from Aber, as given above, and nethy, in the Gaelic, dangerous. Nith or Nithy, is also the name of a river in the south of Scotland, and the name may have been taken from a town at or near its mouth--Abernithy.
Surname type: Location or geographical feature
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic