Yaakov was in Haran and went to Beer'sheva to see his father.He had to cross the Jordon River while going he remembered that he has forgotten his jugs and he went back to his this tent to get the jugs that he had forgot there.Then he had an encounter with esav's angle on this night. They fought till the morning and that moment the angle said i have to go back to the heavens i can't be here now. So Yaakov said i will not let you go ; give me a blessing and then i will let you go back to the heavens. The angle said what is your name? Yaakov said my name is Yaakov . The angle said your new name is Israel because you have fought with Hashem's angle.