Judah (Hebrew: Yehudah) was one of Jacob's (Ya'akov's) sons (Genesis ch.29).
The name of the main sons of prophet Jacob (or Yaqoob) is Youcuf (or Joseph) and Benyamin (or Benjamin)
Judaism, Islam and Christianity are collectively known as "Abrahamic religions" because there roots trace back to Abraham. All religions are monotheistic, which is the belief in the one and only God.