Jacob was left alone; and a man wrestled with him until daybreak. When the man saw that he did not prevail against Jacob, he struck him on the hip socket; and Jacob’s hip was put out of joint as he wrestled with him. Then he said, ‘Let me go, for the day is breaking.’ But Jacob said, ‘I will not let you go, unless you bless me.’ So he said to him, ‘What is your name?’ And he said, ‘Jacob.’

(The Bible)