His name was changed because he had encountered the Lord and that encounter had transformed him. He needed to be given a new name to reflect this, and only God knew what that name should be.
Why did the angel of the Lord wrestle with Jacob? Why did God seemingly, when Jacob was at prayer, put up his hand and say, ‘You must struggle. You must agonize. You must plead. You must cry out for help. You must be truly repentant. You must appeal to me with a believing heart. You must plead for this blessing. I will not hear a slight, superficial, easy cry.’ Many or most of our prayers are quite easy, and there's nothing wrong with that. But sometimes God puts up his hand, and you have got to be more in earnest, more longing, more trusting. This was such an occasion. Perhaps pleading for souls is such an occasion. Perhaps praying for a family member, praying for a certain individual, praying for an act of witness, praying for a great endeavour, praying for a visitation in the community, praying for a great undertaking. Perhaps these things all require something more than just, ‘Lord, bless our effort.’ You feel you have almost seen God face to face. This is the lesson of this passage. There are prayers which are delightful, praises and petitions, and there are some prayers that are so important we had better really be in earnest.
When you come to the Lord, you become a member of the family of God. You obtain such status: you are a child of God. We wrestle with God for salvation, for the sick, or for souls, and what blessing comes to us! Jacob knew he was dealing with but something wonderful and deep. Names have meanings. So what does God’s name mean – what is the special character of my God revealed here? The answer given by Charles Wesley in his hymn about this encounter – ‘Come, O Thou Traveller unknown’ – is love and mercy and forgiveness. From that time Jacob had a much deeper relationship with the Lord, and Esau admitted him to the land.