[And soon enough that subject will become even more baffling! But that'll be a story for another day.]

Mm-hm. [He lowers his hands back to his sides, and takes a moment to search his memory.] If she has a surname, I do not know it. She introduced herself to me with her first name only, so that is how I address her.

[At the question, a brief look of pain crosses his expression.] You have been using it correctly. I do not use my last name anymore. [Oddly enough, his full name could still be accessed on his Xtransceiver. It was the source of some annoyance for him; not only was it a reminder of his disownment, but he also wasn't sure he wanted to be associated with the Harmonia name any longer anyway.] N is my only name now.