I remember reading an article that there were 3 types of readers.
Readers who sub-vocalize the words
Readers who "hear" the words
Readers who "see" words
Not sure if that's an accurate assessment, but I definitely don't sub-vocalize. If I sub-vocalized, I think would at least some general idea how to pronounce unusual character names from fantasy novels. I couldn't have even tried to pronounce most of the character names in Lord of the Rings, immediately after reading it but I could recognize the name patterns if I saw them.