Charles Ellicott Commentary 1 Chronicles 1:29

"These are their generations: the first-born of Ishmael, Nebaioth; then Kedar, and Adbeel, and Mibsam," — 1 Chronicles 1:29 (ASV)

These are their generations. —Or, their genealogy or register of births. Before a personal name the term Tôldôth denotes the "births," i.e., the posterity of the man, and the history of him and his descendants. Before the name of a thing Tôldôth signifies origin, beginnings (Genesis 2:4).

The Hebrew expression sçfer tôldôth answers to the βίβλος γενέσως of Matthew 1:1. The twelve sons or tribes of Ishmael (1 Chronicles 1:29–31) are given first, in an extract from Genesis 25:13-16.

Nebaioth. —The Nabateans of Arabia Petræa, and Kedar, the Cedrei of classical writers, are named together, Isaiah 60:7. (Assyrian Naba’âta and Kidrâ’a reduced by Assurbanipal.)

Adbeel. —Both here and in Genesis the Septuagint read Nabdeel. But Adbéêl is the Assyrian Idiba’îl or Idibi’îl a tribe south-west of the Dead Sea, towards Egypt; mentioned along with Massa and Tema, as paying tribute to Tiglath-pileser II.