How does the Cyclops figure out the real identity of the man who blinded and escaped him even though Odysseus uses the trick name of Noman?

The Cyclops, Polyphemus, realizes the true identity of Odysseus after he calls for help from the other Cyclopes. When they come to his aid, Polyphemus tells them that "Noman" is blinding him, leading them to think he is simply afflicted by a divine punishment. However, when Odysseus reveals his true name, Polyphemus understands that it was Odysseus, the clever man who outwitted him, thus uncovering his identity despite the initial ruse.