"Never underestimate the caprice of an uncaring universe," he suggests sourly, having no better hypothesis.
"Mind you," he cautions, "he resembled Regulus in personality, not in... his sympathies."
"Quite," he agrees, rolling his eyes at most everyone. "Yes, Veris Clayborn. Once I had convinced them I was uninterested in a permanent glamour or a lifelong course of polyjuice, we agreed on a name I would remember to answer to for more than a week at a time, on the premise that a 'why, yes, I am related to your demonic former professor, as a matter of fact' would account for aspects of my person I have no intention of altering."