"Because it’s what my dead mother named me," Tom replies flatly. "I was teased relentlessly for it in first year, amongst other things, until I learned enough magic to... dissuade my housemates. Then I was terribly ridiculed the following year for requesting to switch to the boys’ dorm, but by then, I could defend myself against even the 6th and 7th years. And no one interfered with me after that, and no one objected when I transferred dorms in third year."