בראשית כה:יג פירוש: רש״י, רד״ק, Siftei Chakhamim וRav Hirsch

בשמתם לתולדתם BY THEIR NAMES ACCORDING TO THEIR PROGENY — by the order in which they were born one after the other.

ואלה...לתולדותם, in the chronological order of their birth. The firstborn of them all was Nevayot.

In order of their birth, one after another. Rashi is saying that בשמותם לתולדותם means, [“Their names] in the order of their birth.” Otherwise, why is this phrase said? This explains why it says afterwards, “Nevayos was Yishmael’s first born.”