Yeah, that can be a problem when it comes to japanese every now and then, but when watching the show even in Japanese it's Holo. No worries. Just glad you did your reseach. Another good example would be if you watch the movies for death note and watch the second one, you'll notice that the second Kira uses the eyes of the shimigami to se Light's name, but it's write as moon and read as light.
Yeah, it's kind of interesting at times. That's one reason I want to learn Japanese and live there for a time if not retire there. For some reason since I was a child and I learned about Japan, I've been feeling homesick. I have no idea why since I've never been there.