Voldermort's family and name history

'You see?' he whispered. 'It was a name I was already using at Hogwarts, to my most intimate friends only, of course. you think I was going to use my filthy Muggle father's name for ever? I, in whose veins runs the blood of Salazar Slytherin himself, though my mother's side? I, keep the name of a foul, common Muggle, who abandoned me even before I was born, just because he found out his wife was a witch? No, Harry. I fashioned myself a new name, a name I knew wizards everywhere would one day fear to speak, when I had become the greatest sorcerer in the world!'
Harry's brain seemed to have jammed. He stared numbly at Riddle, at the orphaned boy who had grown up to murder Harry's own parents, and so many others.

THE HEIR OF SLYTHERINE - Pg 329