The Last Conformist said:I read that, but who, honestly, is gonna remember that in ten years? The thing will be known as "Nix", not as "Nyx-spelt-with-an-i", and "Nix" happens to be a fitting name for a little icy world.
Incidentally, "Nyx" and "Nix" are pronounced differently in my language.
In English there is no hard and fast rule. Sticks Styx dykes cliques cliches, so many words that only experience teaches you how to pronounce any of them, it's mix and match mess of a language, good for poetry though.