And Hagar bare Abram a son
Being returned to his house, and received by him, and reconciled to Sarai, she brought forth a son to Abram, according to the prediction of the angel:
and Abram called his son's name, which Hagar bare, Ishmael;
and this name Jarchi suggests he gave by the inspiration of the Holy Spirit that dwelt in him: but it is highly reasonable to suppose, that Hagar upon her return reported to Abram the whole of the conversation she had with the angel; wherefore Abram believing what she said, in obedience to the order and command of the angel, gave him this name.
The Brenton translation of the Septuagint is in the public domain.