Then Jacob was left alone; and a Man wrestled
     with him until
 the breaking of day.  
When He saw that He did not prevail
 against Jacob,
He touched the socket of his hip; and the socket of 

Jacob's hip was out of joint as He wrestled with him.  

And He said, "Let Me go, for the day breaks." 
But Jacob said,
     "I will not let 
You go unless You bless me!"

So He said to him, "What is your name?" 
     He said, "Jacob." 

He said, "Your name shall no longer be Jacob,
                   but Israel; 

for you have struggled with God and with men,
     and have prevailed."

                                    --- Genesis 32:24-27