Name Orgins

The girls were named as part of theme along with all their siblings that were born at the same time as them. Garnet, we know, is named after the gem. Mymble, as best I can figure, is named after the creature The Mymble http://en.wikipedia.org/wiki/The_Mymble. http://www.nationmaster.com/encyclopedia/Mymble. I cannot find any other references to the name or word Mymble that make sense. Perhaps if Angela reads this she can elaborate?