When the giant cyclops asked Odysseus of his name what name did Odysseus give to him?

Odysseus told the giant cyclops Polyphemus that his name was "Nobody." This clever ruse allowed Odysseus to outsmart Polyphemus later when he blinded him; when the other cyclopes came to investigate Polyphemus's cries for help, he could only say that "Nobody" was hurting him, leading them to leave him alone.