Aramaic was the language of Semitic culture, the language of the Hebrew patriarchs and, in the older days, the lingua franca of the Fertile Crescent. The term "Hebrew" is derived from the Aramaic word Abar or Habar which means " to cross over."
This name was given to the Hebrew people simply because Abraham and the people who were with him crossed the river Euphrates and went to Palestine. Therefore, they were known by those who lived east of the river Euphrates as Hebrew, that is, "the people across the river." All branches of the great Semitic people had a common speech.
http://www.omniglot.com/writing/aramaic.htm
This name was given to the Hebrew people simply because Abraham and the people who were with him crossed the river Euphrates and went to Palestine. Therefore, they were known by those who lived east of the river Euphrates as Hebrew, that is, "the people across the river." All branches of the great Semitic people had a common speech.
http://www.omniglot.com/writing/aramaic.htm