Josephus, Jewish Antiquities 1.129

ὃ δ’ ἴσως ὑφ’ Ἑλλήνων ἀγνοεῖται, τοῦτο προειπὼν τρέψομαι πρὸς τὴν ἀφήγησιν ὧν κατέλιπον. τὰ γὰρ ὀνόματα διὰ τὸ τῆς γραφῆς εὐπρεπὲς ἡλλήνισται πρὸς ἡδονὴν τῶν ἐντευξομένων· οὐ γὰρ ἐπιχώριος ἡμῖν ὁ τοιοῦτος αὐτῶν τύπος, ἀλλ’ ἕν τε αὐτῶν σχῆμα καὶ τελευτὴ μία, Νῶχός τέ τοι Νῶε καλεῖται καὶ τοῦτον τὸν τύπον ἐπὶ παντὸς τηρεῖ σχήματος.

I shall speak about the following matter (which is perhaps not known by Greeks), and then return to my narration from the point where I left off. I have given names a Greek form for the sake of the good appearance of my text and for the pleasure of my readers. For this is not the form they have in our country; instead they have a single shape and a single ending, so Noah [Nochos] is called Noë and keeps this form in every case.