As described in historical dictionaries

Patronymica Britannica (1860)

GAD. GADD. A-Sax. gad, a goad or spear. Halliwell quotes from an old MS. :

Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.


BritishSurnames.uk is a Good Stuff website.