As I was reading through some Blogs about LDS Women, I came across this Blog called LDS Women of God and was fascinated by a post on the Abrahamic Covenant called, Taking Upon Us the Name of God.
In the post it explained the meaning associated with the changing of the names of Abraham and Sarah, with the addition of the letter H.
The name change served as a reminder that they had entered into covenants and received further light and knowledge.
I loved the explanation in the Blog, go and check it out!