Genesis 17:15, 16
God also said to Abraham, "As for Sarai your wife, you are no longer to call her Sarai; her name will be Sarah. I will bless her and will surely give you a son by her. I will bless her so that she will be the mother of nations; kings of peoples will come from her."

God is faithful. He does what He says. God is not man that He should change His promises. If He has given you a promise, He will fulfill it at His time. A change of name, a change for the good, a greater blessing. If Abraham and Sarah were living in our times, they would have had to notify their change of names. Imagine this advertisement on the 2nd page of your local newspaper.
Notifying all the change of our names with effect from today :
Abram Terah- Now changed to “Abraham Terah”
Sarai Abram- Now changed to “Sarah Abraham”

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Dr. Johnson Cherian MD. PhD.