RE: question I raised earlier about folklore archetypes in "Hunchback of Notre Dame", I suddenly remembered this from the last time I read an English translation of the book: spoilers for anyone who has not read . Near the end of the book, when Esmeralda, the Spanish Romani girl, is about to be sent to the gallows, Hugo reveals that Esmeralda is actually not Romani at all, but a French girl named Agnes, the illegitimate daughter of a woman who became an anchoress after losing her daughter that she had in an out-of-wedlock relationship with a soldier. Agnes was actually kidnapped by a band of Spanish Romani from Andalusia. Her name was changed to Esmeralda, and Quasimodo was exchanged for her,abandoned on the steps of Notre Dame when he was discovered to be deformed.

So basically, Victor Hugo portarays Romani in a similar way to "The Fair Folk" in British Isles stories. They kidnap beautiful mortal/White European children and replace them with their own deformed babies/changelings. It's the chnageling archetype.