Genesis 25:16
These were Ishmael's children, listed by their names according to their villages and their camps. There were a total of twelve tribal chiefs, according to their clans.
Genesis 17:20
And as for Ishmael, I've heard you. I'll bless him, and he'll have many descendants. I will multiply him greatly, he'll father twelve tribal leaders, and I'll cause his descendants to become a great nation.
Genesis 17:23
Abraham took his son Ishmael and all the servants born in his house or purchased with his money every male among the men of his household and circumcised them that very day, just as God had spoken to him.
Treasury of Scripture Knowledge
Summary
These are the sons of Ishmael, and these are their names, by their towns, and by their castles; twelve princes according to their nations.
Twelve
Bible References
Twelve
Genesis 17:20
And as for Ishmael, I've heard you. I'll bless him, and he'll have many descendants. I will multiply him greatly, he'll father twelve tribal leaders, and I'll cause his descendants to become a great nation.