The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix II
Semitic Roots
ENTRY:
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DEFINITION:
Common Semitic noun *a-, brother. 1.Ahab, from Hebrew ab, father's brother, from a, irregular bound form of , brother (b, father; see b). 2.Sennacherib, from Akkadian Sîn-a-erba, Sin has replaced the (lost) brothers for me, from a, oblique plural of au, brother (erba, he has replaced for me; see rb). 3. Esarhaddon, from Akkadian Aur-aa-iddin, Ashur has given a brother, from aa, accusative of au (see above; iddin, has given; see ntn).
.
b, father's brother, from 
-er
