^^^^Thought this was so cute. ^^^
Well, I guess the reason for 'Good Friday' goes down through history as a translation difference.
It is likely that the name "Good Friday" came from the earlier English name, "Godes Friday," meaning "God's Friday." In much the same way as "God be with ye" was shortened to "goodbye," so did "Godes Friday" become "Good Friday."
Thank you to mom who sent me that. It is also on her blog.