Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
GWILT
As described in historical dictionaries
Patronymica Britannica (1860)
GWILT. Celtic givylt, an inhabitant of the woods. Thompson's Etjonons, p. 3.
Origin: Celtic
Region of origin: British Isles
Country of origin: Wales
Religion of origin: Christian
Language of origin: Welsh