I didn't recognize him, but he who sent me to baptize in water, he said to me, 'On whomever you will see the Spirit descending, and remaining on him, the same is he who baptizes in the Holy Spirit.'

 In the Old Testament a change of name often denoted a new relationship with God. For instance, Jacob became Israel ( Genesis 32:28), and Abram became Abraham ( Genesis 17:5) when they entered into a new relationship with God. When a man enters into a new relationship with God, it is as if life began all over again and he became a new man, so that he needs a new name. 