There was some heated discussion on the origins of Adrian in the Lagavulin thread. It is fairly clear that the name is derived (ahem!) from the town of Atria, which also gave birth (ah, this is feels more scholarly by the minute!) to the Adriatic sea.
I ran across another interesting derivation of Atria, and would like your feedback on it!
According to http://www.etymonline.com, Atria is related from the L. atrum ("black"). Upon further scrutiny (the Lewis & Short Latin Dictionary) atrum itself is a cognate (or whatever!) of the Greek αἴθω (“burnt black like coal”), which is the very godfather (ahem!) of the Ethiopians’ name!