The name of the locality is attested as Savara[REF] in the 6th century,[REF] originating from the name of the stream which followed the Valley of Viroflay, Chaville, Sèvres [REF].
The root is the same for the Sèvre Nantaise and the Sèvre Niortaise which gave its name to the Department of the Deux-Sèvres.