The story
From German Rumpelstilzchen; Wikipedia discusses the hypotheses.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A fairy tale about a dwarf who saves the miller’s daughter by spinning straw into gold in exchange for her first-born child, but is foiled when she guesses his name. Full definition →
From German Rumpelstilzchen; Wikipedia discusses the hypotheses.
Etymology from Wiktionary, CC BY-SA 4.0.