Where did Hebrews have their origins?

Answer 1

"Hebrews" (Ivrim) actually means descendants of Eber (Ever). Ever was an ancestor of Abraham (Genesis ch.10-11) and the earliest Hebrews were Abraham's uncles and cousins for several generations back. They were among the Western Semites and lived in northern Mesopotamia, near the confluence of the Balikh and the Euphrates.
Abraham himself was called a Hebrew (Genesis ch.14) because of his wider family. Poetically, however, Abraham is called Ivri because the name also translates to "other side." Abraham was figuratively on "the other side" since he was the only monotheist (Midrash Bereshit Rabbah 42:8) until his teachings took root. His ancestors and cousins had slipped into idolatry well before his time, as is evident from Genesis 31:30, 31:53, and Joshua 24:2.
However, "Hebrews" is often used to mean Abraham and his Israelite descendants, instead of his wider family. In this sense it refers to the Jewish people.