Why does Alonso Quixano rename himself Don Quixote?

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Alonso Quixano renames himself Don Quixote because he becomes obsessed with reading chivalric romances. Driven by these stories, the aging minor nobleman decides to revive the custom of knighthood and become a hero himself.123

By adopting the name Don Quixote, he assumes the identity of a knight-errant and sets out from his home in La Mancha to seek adventure, mistakenly viewing the mundane world through the lens of the romantic tales that have bemused his mind.12