Deux-Sèvres is a French department. Deux-Sèvres literally means "two Sèvres": the Sèvre Nantaise and the Sèvre Niortaise are two rivers w…Deux-Sèvres is a French department. Deux-Sèvres literally means "two Sèvres": the Sèvre Nantaise and the Sèvre Niortaise are two rivers which have their sources in the department. It had a population of 374,878 in 2019.