Passage 8.37.9
ταύτην μάλιστα θεῶν σέβουσιν οἱ Ἀρκάδες τὴν Δέσποιναν, θυγατέρα δὲ αὐτὴν Ποσειδῶνός φασιν εἶναι καὶ Δήμητρος. ἐπίκλησις ἐς τοὺς πολλούς ἐστιν αὐτῇ Δέσποινα, καθάπερ καὶ τὴν ἐκ Διὸς Κόρην ἐπονομάζουσιν, ἰδίᾳ δέ ἐστιν ὄνομα Περσεφόνη, καθὰ Ὅμηρος καὶ ἔτι πρότερον Πάμφως ἐποίησαν· τῆς δὲ Δεσποίνης τὸ ὄνομα ἔδεισα ἐς τοὺς ἀτελέστους γράφειν.
The Arcadians especially venerate this goddess, Despoina, whom they say is the daughter of Poseidon and Demeter. Her popular title among most people is Despoina, in the same manner as they also call by the name Kore the daughter of Zeus, but whose personal name is Persephone, as Homer and still earlier Pamphos composed. As for the name of Despoina, I feared to record it for those who are uninitiated.