According to archaeologist Stephen J. Yeates, the original Tribe of Witches was the Anglo-Saxon people called the Hwicce, who inhabited the Cotswolds and Severn Valley of what is now southwestern England.
These were previously the tribal territories of an early Iron Age Keltic people known as the Dobunni. Both genetics and archeology suggest strong demographic and cultural continuity from the Keltic to the Anglo-Saxon periods.
The name Dobunni, known from inscriptions and Roman historians (Yeates 2-3), is of uncertain etymology. Yeates himself does not discuss a derivation.
It may be, though, that this ethnonym preserves a memory of the origins of the tribe itself.