The old name of December is “Undrea”. This comes from St. Andrew’s celebration (November 30th), which announces the beginning of the month. In the old language, “Andrew” (Romanian: Andrei) became in time “Andrea” and then “Undrea”.
Naming a month of the year after a feast of the previous month reminds of an ancient cycle of celebrations from the end of the autumn and the beginning of the winter, when the Dacian New Year was probably celebrated.
December is the month of snow, when the peasants’ economic activity reduces, leaving the place for the ritual and spiritual preparations.