Semantics trying to fool yourself that the Jewish people are not in scripture because of the various terms used throughout their history. They are still the same people group. Not interested in semantics.Jacob was not a Jew.....he was a Hebrew......descended from "Eber" through Abraham et.al.
His son, Judah was the first Jew identified by scripture as well as history (see post #15).
Only three tribes were ever (in scripture) called Jews.......Judah, Benjamin and much of Levi. The latter two because of their affiliation with Judah in the southern kingdom and subsequent captivity in Babylon.
It is not scriptural.....or historical fact......to refer to the northern ten tribes as Jews. Simply because it is never documented that way by the Great God of the universe, Yahweh.