And whence is it derived that they did not change their names? Just as they were called in their descent (to Egypt) — Reuven, Shimon, Levi, and Yehudah (viz. Ibid. 1:2) — so, they were called upon their ascent (viz. Numbers 1:18). And it is written (Genesis 48:16) "The angel who redeems me … and let there be called in them my name and the name of my fathers, etc."