Edward
Grandpa Lyall called him Edward.
It had been special and different, when he was still a little boy, and unpronouncable, because it was much too long.
And then: "Gramps, stop calling me that. It's the name of that stupid vampire."
Because his Muggle cousins, Grandpa Ted's family, loved this book, with those vampires and weird, weird werewolves, without him being able to tell them that everything they were reading was utter nonsense, and because they suddenly just loved his name.
Grandpa Lyall's amber eyes had twinkled, amused and confused, and he had continued to call him Edward, because "that's your name, my boy".
So he let it slip with his grandfather and glared at everybody, who suddenly thought it was "so cool" that his name was Edward, replying: "Ted-dy. Not so hard, is it?"