I've never heard of a nickname for Harry/Hermione as a pair. Hermarry? Harrione? Hermotter? xD! You don't see a lot of it any more, whereas once upon a time it was one of the most popular het pairings. It seems to be all about Dramione these days! There weren't really that many well developed female characters in canon to play with, so Hermione and Ginny pretty much dominated het fics.

And ooooh how exciting!!