Tajik people
It is generally accepted that the origin of the word Tajik is Middle Persian Tāzīk "Arab" (New Persian: Tazi), or an Iranian (Sogdian or Parthian) cognate word. Some Turks of Central Asia adopted a variant of this word, Täžik, to designate the Persian Muslims in the Oxus basin and Khorasan, who were the Turks' rivals.