What name did J.K. Rowling give the fairy tale collection mentioned in Harry Potter?

J.K. Rowling named the fairy-tale collection mentioned in Harry Potter The Tales of Beedle the Bard.

In Harry Potter and the Deathly Hallows, Albus Dumbledore leaves Hermione Granger a copy of the collection. One story, “The Tale of the Three Brothers,” explains the legend behind the Deathly Hallows: the Elder Wand, the Resurrection Stone, and the Cloak of Invisibility. The book therefore provides important clues during the final novel’s search for Voldemort’s hidden objects.

Rowling later published The Tales of Beedle the Bard as a standalone book in 2007. It contains five wizarding fairy tales, each followed by commentary attributed to Dumbledore. The publication also supported charitable work through the Children’s High Level Group. The title refers to Beedle, a fictional medieval wizarding storyteller, rather than to a historical author from the real world.