The ethnonym "Kurd" may ultimately derive from an ancient toponym in the upper Tigris basin. There are several ideas concerning the etymology of the ancient toponym "Adria/Atria". In Greco-Roman epigraphs, "Aethiopia" was a specific toponym for ancient Nubia. The toponym Sokhumi derives from the Georgian word Tskhomi/Tskhumi, meaning "beech". The city's name derives from its Celtic toponym, "Beda". According to Fan Noli, the surname is a toponym, of Kastriot in modern northeastern Albania. These terms are believed to be cognates of the toponym "Atlas". The same name is likely reflected in the toponym Bjarmaland in Norse sagas. The geologic period of the Permian takes its name from the toponym. Two alternative etymologies have been proposed for the toponym "Gusinje". The origin of the toponym "Henna" remains obscure. Wantage was a small Roman settlement but the origin of the toponym is somewhat uncertain. The toponym Chiltern is believed to be Brittonic in origin. The origin of the toponym is unknown. Alternatively, the name is compared with the toponym Ararat or Urartu.