[1] The neuter headword is actually in the plural, ἕΛεα , but any given city would of course be singular; Stephanus of Byzantium s.v. gives (with this etymology) the instance of Helos in Laconia.
[2] ἑΛεάτης , with the rough breathing, is attested only here. This adjunct to the entry looks like a repetition, with altered aspirate, of what epsilon 768 has said about Elea.