Genesis 14:13

Abram the Hebrew - See note on Genesis 10:21. It is very likely that Abram had this appellation from his coming from beyond the river Euphrates to enter Canaan; for haibri , which we render the Hebrew, comes from abar , to pass over, or come from beyond. It is supposed by many that he got this name from Eber or Heber, son of Salah; see Genesis 11:15. But why he should get a name from Heber, rather than from his own father, or some other of his progenitors, no person has yet been able to discover. We may, therefore, safely conclude that he bears the appellation of Hebrew or Ibrite from the above circumstance, and not from one of his progenitors, of whom we know nothing but the name, and who preceded Abram not less than six generations; and during the whole of that time till the time marked here, none of his descendants were ever called Hebrews; this is a demonstration that Abram was not called the Hebrew from Heber; see Genesis 11:15-27.

These were confederate with Abram - It seems that a kind of convention was made between Abram and the three brothers, Mamre, Eshcol, and Aner, who were probably all chieftains in the vicinity of Abram' s dwelling: all petty princes, similar to the nine kings before mentioned.