I'm disinclined to pick for you, [ he demurs, ] but for convenience's sake I may pick something if that's alright. Perhaps Ms. Corvus?

[ Bird-themed, of course, if it's left up to Harold's discretion. Picking a last name seems less intrusive than a first, maybe because he's constantly changing his own. And having dealt with how annoying it is to have an acquaintance named Accelerator, Harold finds himself more willing to come up with something than he was initially. ]