This conventional Latinate spelling of the names has a traditional pronunciation system, one that corresponds with neither the Greek nor the Latin sounds. Perhaps “system” is not the best word for it, since it is full of inconsistencies. But it is the pronunciation English poets have used for centuries, the sounds they heard mentally as they composed and that they confidently expected their readers to hear in their turn. Since there seems to be no similar convention for the English pronunciation of modern transliterated Greek —is the h sounded in Akhilleus? is Diomedes pronounced dee-oh-may’-days or dee-oh-mee’-deez? —we have thought it best to work with pronunciation that Keats and Shelley would have recognized.

Unknown, Homer, Robert Fagles_ Knox,…, loc. 317