John testified, saying, "I have seen the Spirit descending like a dove out of heaven, and it remained on him.

 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. 