The term Caucasus is derived from Caucas the forefather of Nakh peoples. According to Leonti Mroveli, the XI century Georgian chronicler, the word Caucasian is derived from the Vainakh ancestor Kavkas.
"The Vainakhs are the ancient natives of the Caucasus. It is noteworthy, that according to the genealogical table drawn up by Leonti Mroveli, the legendary forefather of the Vainakhs was "Kavkas", hence the name Kavkasians, one of the ethnicons met in the ancient Georgian written sources, signifying the ancestors of the Chechens and Ingush. As appears from the above, the Vainakhs, at least by name, are presented as the most "Caucasian" people of all the Caucasians (Caucasus - Kavkas - Kavkasians) in the Georgian historical tradition."