This was the name of two biblical men.
Ishmael's eldest son (Genesis 25:13), and the prince of an Israelitish tribe (16). He had a sister, Mahalath, who was one of Esau's wives (Genesis 28:9; 36:3).
The name of the Ishmaelite tribe descended from the above (Genesis 25:13, 18).
The “rams of Nebaioth” (Isaiah 60:7) are the gifts which these wandering tribes of the desert would consecrate to God.