What is the origin of the word "rumpelstiltskin"?

The name Rumpelstilzchen in German means literally "little rattle stilt". (A stilt is a post or pole which provides support for a structure.) A rumpelstilt or rumpelstilz was the name of a type of goblin, also called a pophart or poppart that makes noises by rattling posts and rapping on planks. The meaning is similar to rumpelgeist ("rattle ghost") or poltergeist, a mischievous spirit that clatters and moves household objects. (Other related concepts are mummarts or boggarts and hobs that are mischievous household spirits that disguise themselves.) The ending -chen is a German diminutive and designates something as "little" or "dear", depending on context.
The earliest known mention of Rumpelstiltskin occurs in Johann Fischart's Geschichtklitterung, or Gargantua of 1577 (a loose adaptation of Rabelais' Gargantua and Pantagruel) which refers to an "amusement" for children named "Rumpele stilt or the Poppart".

Sorry, I needed to accredit Wikki! https://en.wikipedia.org/wiki/Rumpelstiltskin#Name_origins