The myth of Krampus might date back to pre-Christian pagan traditions that later melded with Christian tradition. Since the holiday's origins are so old, they are difficult to verify with total certainty.
As hinted at, the way this holiday is celebrated differs based on region. It is celebrated in Austria, Germany and several other countries. That is why there are several names for the same figures as well as other varying details, like how St. Nick arrives.
