Hmm, I never thought of that. It actually is kind of odd that he remembers his name but not some other things like his fight. However, perhaps it could be argued that his name is just simply of more importance to him than this fight and, since Komugi was a bit further away in his memory, that is why he doesn't remember her. I don't know. Then again, they did say it was probably partial amnesia right?
Either way, I like the set up. It's Meruem's Human (represented by Komugi) vs. his Ant (represented by Pouf attempting to kill her) side. Which one will win out?