Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
GUNN
As described in historical dictionaries
Patronymica Britannica (1860)
GUNN. GUN. An ancient personal name, or rather a contraction of one, such as Gundebert, Gundric, or Guudbald.
Origin: Celtic
Region of origin: British Isles
Country of origin: Scotland
Religion of origin: Christian
Language of origin: Gaelic