The Parthian country it mentions under the name of Nisaya or Nisaea, implying apparently that the Parthians were not yet settled in it.

The only ready way of reconciling the geography of the Zendavesta with that of later ages is to suppose the Parthians a non-Arian nation who intruded themselves among the early Arian settlements, coming probably from the north, the great home of the Turanians.
Some positive arguments in favor of the Turanian origin of the Parthians may be based upon their names.

The Parthians affect, in their names, the termination -ac or -ah, as, for instance, in Arsac-es, Sinnac-es, Parrhaces, Vesaces, Sana-trseces, Phraataces, etc .-- a termination which characterizes the primitive Babylonian, the Basque, and most of the Turanian tongues.

The termination -geses, found in such names as Volo-geses, Abda-geses, and the like, may be compared with the -ghiz of Tenghiz.

The Turanian root annap, "God," is perhaps traceable in Amm-inap-es.