If true, this cannot stand

Genesis
Chapter 25
And it came to pass after the death of Abraham, that God blessed his son Isaac; and Isaac dwelt by the well Lahairoi.

12 Now these are the generations of Ishmael, Abraham's son, whom Hagar the Egyptian, Sarah's handmaid, bare unto Abraham:

13 And these are the names of the sons of Ishmael, by their names, according to their generations: the firstborn of Ishmael, Nebajoth; and Kedar, and Adbeel, and Mibsam,

14 And Mishma, and Dumah, and Massa,

15 Hadar, and Tema, Jetur, Naphish, and Kedemah:

16 These are the sons of Ishmael, and these are their names, by their towns, and by their castles; twelve princes according to their nations.

17 And these are the years of the life of Ishmael, an hundred and thirty and seven years: and he gave up the ghost and died; and was gathered unto his people.