Pseudonym

A pseudoynm is a fake or alternative name given to someone;


 * a) to disguise their real identity
 * b) because it sounds cooler than their original name.

Examples
Hitler's real name was Colonel William Kardon Steinberg, but he changed it because he was anti-Semitic and didn't want a Jewish name.

David Cameron's real name is David Dirty Political Opportunist-eron. But he changed it because he thought everyone would think him a "dirty political opportunist" for some reason.

Vladimir Lenin's real name was Vladimir Illyich Ulyanov, but no one would remember it, so he changed it to Lenin.

The Right wing was originally called the Wrong wing until it was changed in 1926 to make people think it was always right.