Why does Odysseus reveal his name to Polyphemus after escaping the cave?

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Sixteenth-century engraving by Hieronymus Wierix depicting Homer, shown as an older man with a beard and laurel wreath, wearing a draped garment. — Odyssey: A Reader’s Guide to Homer’s Epic Engraving of Homer by Hieronymus Wierix, 16th century; in the Rijksmuseum, Amsterdam.

After escaping the cave of Polyphemus, Odysseus reveals his true identity to the blinded Cyclops due to a fatal mistake born of pride.1

Although he had successfully deceived the giant by calling himself "Nobody" while trapped, Odysseus could not resist the urge to boast once he reached the safety of his ship. By shouting his real name, he sought to claim credit for his cleverness and victory. This act of hubris proved disastrous; Polyphemus, who had previously been warned by a prophecy that he would lose his sight at the hands of Odysseus, used the hero's name to call upon his father, Poseidon, to curse Odysseus’s journey home. This prayer resulted in the long, arduous series of misfortunes that prevented Odysseus from returning to Ithaca for many years.1