ABA was the Naiad-nymph of the springs, well or fountain of the town of Ergiske in Kikonia (Ciconia), Thrake (Thrace). She was the mother of the town's eponymous founder Ergiskos (Ergiscus) by Poseidon.
Presumably a daughter of the River HEBROS
ERGISKOS (by Poseidon) (Suidas s.v. Ergiske)
CLASSICAL LITERATURE QUOTES
Suidas s.v. Ergiske (trans. Suda On Line) (Byzantine Greek lexicon C10th A.D.) :
"Ergiske (Ergisce) : It is in Thrake, [and was named] after Ergiskos (Ergiscus) the son of Poseidon and Aba, a Nymphe."
- Suidas, The Suda - Byzantine Greek Lexicon C10th A.D.