The Isuwans left no written record of their own, and it is not clear which of the Anatolian peoples inhabited the land of Isuwa prior to the Luwians. Aram Kosyan identified etymologically Hittite, Luwian, Indo-Iranian (possibly connected to the Mitanni), Hurrian, and Kaskian personal names in Isuwa, as well as a number of anthronyms with unknown or unclear origins.Aram Kosyan. "To the East of Hatti." Essays in Honour of Veli Sevin (ed. A.Ozfirat). Yayınları. Istanbul, 2014, p. 278.Aram Kosyan. "On the Ethnic Background of Isuwa (A Preliminary Study)." Aramazd: Armenian Journal of Near Eastern Studies. Vol. 4. Issue 2. 2009.
