Of course Crake wasn't Crake yet, at that time; his name was Glenn. Why did it have two n's instead of the usual spelling? "My dad liked music," was Crake's explanation, once Jimmy got around asking him about it, which had taken a while. "He named me after a dead pianist, some boy genius with two n's."
2003, Margaret Atwood, Oryx and Crake, Virago, published 2004, page 80