Etymology of Totnes

Can any of your readers suggest a probable etymology for Totnes, the "prime town of Great Britain," as it is called by Westcote1, who supposes it to have been built by Brutus, 1108 years before the Christian era. Mr. Polwhele, who supposed the numerous *Hams* in Devon to have owed their names to the worship of Jupiter *Hammon*, would, I imagine, have derived Totnes from the Egyptian god Thoth or Taut; or, perhaps, directly from King Thothmes. Westcote observes that some would have the name from,— "The French word *tout-à-l'aise*, which is in English, all at ease; as if Brutus at his arrival in…