Question

Groundhog day is based on another named holiday from the germans. what is it called

Answer 1

Well, in European countries, the day was known as Candlemas Day.
It was known as the Feast of Purification of the Virgin Mary, when Christ's parents presented him in the temple.
The name Candlemas Day comes from the custom of blessing candles on this day.

Answer 2

As vlavenderv said, Germans call it Candlemas day or Lichtmess Tag