Sforno on Genesis 25:26/ספורנו על בראשית כ״ה:כ״ו

1ויקרא שמו יעקב. The word means he will remain at the heel, and the tail-end. This is based on the future mode of the word יעקב. Our sages (quoted by Rashi) say that the subject in our verse is G’d Who named Esau’s brother Yaakov, the reason for the unusual formulation being that after the destruction of the Kingdom of Edom and other nations, successor of Esau, only Yaakov and his descendants will remain. Our sages base all this on Jeremiah 46,28 אעשה כלה בכל הגויים...ואותך לא אעשה כלה, “I will make an end of all nations…but I will not make an end of you.”