is only a shortform in german, the "correct" is the same:
names orgin is at greek βάρβαρος, bárbaros „die Fremde/ the foreign“.
The St. Barbara's feast in the liturgy of the Catholic and the Greek Orthodox Church is since the 12th century the 4th December, which is popularly called Barbara-day.
According to an old tradition at St. Barbara branches of a fruit tree (usually from a cherry tree, an apple tree) or cut of a forsythia and put into the water. This Barbara Branches, in the Alps named Barbara-Tree, will bloom until Christmas Eve, and in the cold and dark winter time bring a little light into the apartment. This goes back to a single train of legend: On the way to the prison Barbara stayed with her robe hanging on a branch. She put the broken branch in a container with water, and he flourished on the very day on which she was sentenced to death. http://de.wikipedia.org/wiki/Barbara_von_Nikomedienhttp://en.wikipedia.org/wiki/Saint_Barbara