In token of this, his name was changed from Abram, a high father, to Abraham, the father of a multitude. This was to confirm the faith of Abraham, while he was childless; perhaps even his own name was sometimes an occasion of grief to him: Why should he be called a high father, who was not a father at all? But now, God having promised him a numerous issue, and given him a name which signified so much, that name was his joy.
Related Commentaries of Genesis 17:5
Genesis 17:5
5 Neither shall thy name any more be called Abram, but thy name shall be Abraham;c for a father of many nations have I made thee.