If we would go on to Genesis 25:12-18, we find that Ishmael had 12 sons, which became 12 tribes, which is very interesting. It is almost a mirror of what happened with Jacob, that Jacob had 12 sons which became 12 tribes. So it is kind of interesting to see that God paralleled it there.
And then if you go into Galatians, you will see that Hagar and Ishmael were a sign of this covenant that was not good, as opposed to Sarah and Isaac, which were a sign of the proper godly covenant.
And so this thing about the 12 tribes of Ishmael and the 12 tribes of Israel seemed to have some sort of a correlation there. It is interesting nonetheless.