Ulaia1
Harry Potter was not a normal boy. Anybody who had met him, magical or not, knew it.
This, along with his cousin's tendency to bully Harry and anyone who associated with him, made it such that the boy had no friends. He didn't mind; in fact, he preferred it, at least for now.
Harry Potter didn't even like being called Harry Potter. This was in part due to not knowing his name until his primary school teacher told him that he was Harry Potter.
He still didn't particularly care for the name, so, when his cousin's lackeys forced him to hide in a recycling bin, where he found an English-to-Latin thesaurus, he looked through it and found what he thought the perfect name for himself:
Leto* Exanimalis* Mors*
With his new name and his ghostly companion by his side, he'd take the magical world by storm.
So what if it involved creating a whole new identity or five?
*(Leto:) slay, kill, murder, dead, deaden, homicide
*(Exanimalis:) breathless, dead, deadly, lifeless
*(Mors:) death, destruction, deadness, decease, defunction, depart