Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
GIRVAN
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
(origin: Local) From the river and town of Girvan in Ayrshire, Scotland. In the Welsh, Gearafon or Gwyrddafon, implies the river flowing through the green flourishing place, from afon or avon, a river, and Gwyrdd, green, flourishing.
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