"The original Armenian name for the country was Hayq, later Hayastan, translated as the land of Haik, and consisting of the name Haik and the Sanskrit suffix '-stan' (land). According to legend, Haik was a great-great-grandson of Noah (son of Togarmah, who was a son of Gomer, a son of Noah's son, Yafet), and according to tradition, a forefather of all Armenians. Mount Ararat, a sacred mountain for the Armenian people, rising in the center of the Armenian Highland as its highest peak, is traditionally considered the landing place of Noah's Ark.
The name Armenia was given to the country by the surrounding states, as it was the name of the strongest tribe living in the historic Armenian lands, who called themselves Armens. It is traditionally derived from Armenak or Aram (the great-grandson of Haik's great-grandson, and another leader who is, according to Armenian tradition, the ancestor of all Armenians)."
From: http://en.wikipedia.org/wiki/History_of_Armenia