Sforno on Genesis 32:29/ספורנו על בראשית ל״ב:כ״ט

1לא יעקב יאמר עוד שמך, a reference to the end of days when Israel will have survived the destruction of the gentile nations When that time comes no one ever will again use the name Yaakov for the Jewish people [and the stigma that used to be associated with that name. Ed.] The very word יעקב already contained within this message that the bearer of this name will triumph at the end. Once he has triumphed there is no more point in having a name which alludes to something which will be realised only in the future. The future will then have arrived!

2כי אם ישראל כי שרית, they will only refer to as “Israel.” This new name is to confirm that שרית עם אלוקים ועם אנשים, this is analogous to Isaiah 24,21 יפקוד ה' על צבא המרום במרום ועל מלכי האדמה על האדמה, “in that day the Lord will punish the host of heaven in heaven and the kings of the earth on earth.”