Tây Nhung

thumb|300px|Asia in 400 AD, showing the Xionites ("Chionites") and their neighbors. Xionites, Chionites, or Chionitae (Middle Persian: Xiyōn or Hiyōn; Avestan: X́iiaona-; Sogdian xwn; Pahlavi Xyōn) were a nomadic people in the Central Asian regions of Transoxiana and Bactria.