Hebrew is a name given to the Jewish Patriarchs and later to the children of Israel in the Torah. Eventually it referred to the language of the Israelites. Its origins are unclear – it could refer to a specific place, person or just be a generic name for the people of Israel or a tribal confederation it was a part of (known as the chabiru).
In Jewish tradition, Hebrew is a term which denotes the special status of the Jewish Patriarch Abraham, who stood separate from the world as though they were on opposite sides of a river (The word Hebrew derives from a word that can refer to a bank of a river). He was on one side, believing in on God and the rest of the world was on the other (believing in many Gods).