David, as you are aware the Greek alphabet is different and the traditional way of transliterating the f sound was to use ph. I'm not sure if it is general but certainly here in Cyprus several years ago the powers that be decided that for non-native English speakers that would be confusing and so they changed all the spellings replacing the ph with f. So the town of Paphos became Pafos, and so on. They didn't leave it at that but messed around with others too, such as Larnaca becoming Larnaka, Yermosoyia became Germasogia though how that helped with the pronunciation is anyone's guess.