I knew a "Miss Hermy" from my grandmother's church, and her full named was pronounced "HER-me-un." It was spelled Hermione. I didn't know how the name was supposed to be pronounced until taking a graduate Shakespeare course and we read Winter's Tale! The professor referenced HarryPotter as well, and I was floored. Suddenly a name I cringed at became beautiful!
I've been saying that completely wrong. That's a much prettier pronunciation than what I had guessed at.