That Frau Bertha is an impersonation of the Epiphany there seems little doubt, but it appears that there was an original mythical Bertha, who absorbed the brightened night, or if the bright night gave a new title to the old mythical Holda, Holla, Hulla, Huldr (the faithful, or the muffled), a white spinning lady, who is making her feather-bed when it snows.  She, too, brings presents at the year's end; rewards good spinners, punishes idle ones, has a long nose, wears a blue gown and white veil, and drives through the fields in a car with golden wheels.  Scandinavia calls her Hulla, or Huldr the propitious; Northern Germany, Holda, probably by adaptation to hold (mild).  Franconia and Thuringia recognized both Holda and Berchta; in Alsatia, Swabia, Switzerland, Bavaria, and Austria, Berchta alone prevails. (History of Christian Names, Yonge, 1884)