Why is it called Good Friday?

Why is it called Good Friday?
There are different theories on how it came to be called this. 

• At one point in the english language the word good meant holy.
  
  

• Instead of Good Friday, it used to be called God Friday and it got changed as the tradition moved between cultures. Kind of like the game telephone.
  
  

• It's called good because of what it means theologically. While the event is horrific, what Jesus death accomplished was history changing.

Most likely the truth is a mix of point one and three. Jesus death set into motion a new way (John 14:6) for all of humanity to be freed from sin and reconciled to God. That is truly good!