What motivates Odysseus to tell a lie to the Cyclops? Odysseus knows that Poseidon is the Cyclops’ father. Odysseus is afraid the Cyclops will steal their ship. Odysseus does not want to reveal their only means of escape. Odysseus does not know what has happened to his ship.
He lied to him because he knew that the Cyclops would call his brothers to see what happened to him, when he got blind, he said his name was "nobody" so that's why Cyclops yell out: "Nobody has blinded me". So the reacton of his brothers wouldn't be so noticeable. The third answer is the one that fits more to the explanation.