And God said unto Abraham, As for Sarai, thy wife, thou shalt not call her name Sarai, but Sarah shall her name be. This change of names is significant, for the wife of Abraham, heretofore known as Sarai, "the princely," "heroine," was hereafter to be called Sarah, "princess," as the ancestress of princes and kings. Thus the promise of God narrowed down, first from a member of Abraham's household to a son of his own body, and now to his own son by Sarah, his wife, not by some slave woman.
Related Commentaries of Genesis 17:15
Genesis 17:15
15 And God said unto Abraham, As for Sarai thy wife, thou shalt not call her name Sarai, but Sarahe shall her name be.