Attested only here, with this accentuation; but note the accusative plural *so/fakas at the end of Josephus, Antiquities of the Jews 1.241 [= Alexander Polyhistor fr.7], asserting that because of Sophon, the son of a son of Heracles (who had married a granddaughter of Abraham!) called Didorus, 'barbarians are called Sophakes'. (Different names and relationships in Plutarch, Sertorius 9.8-10.)