The Spanish word for that is quixote. As in Don Quixote -- the first of two puns in the title of the book. The second is "la Mancha." It is the name of the plain in Spain, and it comes from the Arabic word for "plain." But "mancha" is also a stain, as in a stain on one's honor. So "Don Quixote de la Mancha," "Sir Thigh-Armor of the Stain."