(Greek, nobody). A name assumed by Odysseus in the cave of Polyphemos. When the monster roared with the pain from the loss of his eye, his brother giants demanded from a distance who was hurting him:
“Nobody,” thundered out Polyphemos, and his companions went their way. Odysseus in Latin is Ulysses.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894