I'm also begining to really like Hermione, but I don't think it's that popular because of the Harry Potter books and movies. It may see somewhat of a surge in popularity but I don't see it ever reaching the top 50 in any country especially in the USA or Great Brittan. It has that old-world, perhaps to some old-lady and geeky feel, that people tend to stay away from. They may like the sound of it but when it comes to the point they propably won't use it for their daughter! :)
So have no fear! If you love it, and want to use it for someone you love, it will be all the more beautiful by having been chosen with love. Go for it! A Hermione would be so refeshing in the midst of Baileys, Ashleys, Kaitlyns and Rileys! :)