Dictionary of Greek and Roman Geography/Abrauannus
ABRAUANNUS (Αβραουάννος), Ptol. ii. 3. § 2), a river of Britannia Barbara, which discharges itself a little northward of the Promontorium Novantum, or Mull of Galloway into Luce-Bay. Abravannus is probably the stream which flows through Loch Ryan into the sea—Ab-Ryan, or the offspring of Ryan, being easily convertible into the Roman form of the word Ab-Ryan-us—Abravannus.[ W. B. D. ]