John Calvin Commentary Genesis 16:15

"And Hagar bare Abram a son: and Abram called the name of his son, whom Hagar bare, Ishmael." — Genesis 16:15 (ASV)

And Abram called. Hagar had been commanded to give that name to her son; but Moses follows the order of nature: fathers, by bestowing the name, declare the power they have over their sons. We may easily gather that Hagar, when she returned home, related the events that had occurred. Therefore, Abram shows himself to be obedient and grateful to God, because he both names his son according to the angel's command and celebrates God's goodness in having paid heed to Hagar's miseries.

CHAPTER 17.