Abraham and Sarah were originally named Abram and Sarai, but, for some strange reason, God changed their names in chapter 17 of Genesis (17:5, 15) to Abraham and Sarah.

To avoid confusion, I'll use their new, more familiar, God-given names in the notes.

See notes: Gen 11:26, 12:1, 13:1, 15:1, 16:1, 17:1