Ok, so far thanks for some good guesses about the "good" part.

Now, for the Friday part.

I have a need to know if Good Friday is based on the current calender we use. For example, Good Friday can't always be April 9th. How do we know that the event of Jesus' death happened on a Friday at all? what year did this happen and on what date?

Why is Jesus' birth celebrated on December 25th no matter what year it falls on (with the exception I think of the Greek Orthodox) and yet some 33 years later no matter what that fateful calender date was of his crucifixion, it's always a Friday?