Genesis 25:13. And these are the names of the sons of Ishmael, by their names, according to their generations; the firstborn of Ishmael, Nebajoth; and Kedar, and Adbeel, and Mibsam,
25:18. And they dwelt from Havilah and Shur, that is before Egypt, as thou goest toward Assyria; and he died in the presence of all his brethren.
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Nebaioth, Nebajoth, the "first-born of Ishmael", and father of a pastoral tribe named after him, the "rams of Nebaioth" being mentionedby the prophet Isaiah with the flocks of Kedar. From the days of Jerome this people had been identified with the Nabathaeans, of whom Petra was the capital,until M. Quatremere first investigated the origin of the latter, their language, religion, and history. It is possible that Nebaioth went to the far east, to the country of his grandfather Abraham, intermarried with the Chaldaeans, andgave birth to a mixed race, the Nabat. It is, however, safest to leave unsettled the identifcation of Nebaioth and Nabat until another link be added to the chain that at present seems to connect them. [Smith's Bible Dictionary, William Smith]