If you're a HP fan, you've probably seen this (tentative yet well-placed) spoiler for book 7. Of course, if you have any contact with the internet (as I assume my readers do XD), you were probably well aware of the fan speculation on this point, and it's fun to know that we were (probably) right.

Of course, there goes my theory that it was actually LJ user Indilime, who indeed shares those same initials.