In Greek mythology, Aba () was a Thracian naiad from the town of Ergisce in Ciconia. She became the mother of a son Ergiscus by Poseidon, after whom ÃÂatalca (Ergisce) took its name. Aba is presumed to be a daughter of the river Hébros ().
The source is uncertain, but it is likely related to aúo (, 'to shout, to call'). It is also speculated that it denotes a large Mediterranean sea-cow. Additionally, it is also coincidentally the Aiolic variation of the Doric word hébe (, 'youth').