“The angel of Yahweh.” See commentary on Genesis 16:7, “angel of Yahweh.”
“Ishmael.” “Ishmael” means “God hears,” but in the Hebrew idiom, “hear” is often used in the pregnant sense of hearing and doing something about the situation. Very often the Bible saying God “hears” is not just a statement of fact, after all, He hears everything, but rather it is a statement that God hears and will act. We conflate the REV text to reflect that point.