As a non-native English speaker I've often wondered how you are supposed to pronounce "Hiero", the main character from the eponymous Hiero's Journey by Sterling Lanier: to my unlearned ear "HEE-ro" (just like "hero") sounds fine but it occurred to me that the name could also be spoken as "HI-ro" (like "hieroglyph", for example), so I'm uncertain which one is the correct pronunciation.
Could you help me solve this doubt?