This surname is said to date back to the 13th Century, originating in Kent possibly as a nickname for a fishmonger or baker. A “fagg” was a flat fish, plaice or flat loaf. Another possible source may be from the words “fagge” (a cloth weave fault) or “fage” (deception or flattery).
Variations of the name may include Vag and Vagg, since Southern England considered “V” the normal pronunciation of “F” and replaced it.
Examples include Richard (le) Vag (Somerset, 1269) and Sir John Fag (died 1701; Parliamentarian, Colonel, M.P., commissioner for Charles I’s trial, imprisoned for a Sussex uprising in 1659).