‘Good Friday’ is a religious holiday, celebrated traditionally by Christians as the day on which Jesus was crucified. It is the Friday immediately preceding Easter Sunday.
Knowing that Jesus died on ‘Good Friday’, we actually know that nothing good happened on this day. This paradoxic nature of the name of such an important day led many to do some research on the ‘why’ related to this question.
Those who believed more in logic than etymology hold the view that the results of Christ’s death are very good and that’s how happened this holy day to be called ‘Good Friday’.
Others (like me) followed the etymology of the word good and they’ve discovered the following. The word good used to have a secondary meaning of holy, which explains why this day is also know as also known as Holy Friday or Great Friday.
Furthermore, there are a large number of cases in set phrases where the words God and good got switched around because of their similarity. One case was the phrase God be with you, which today is just good-bye. So some people took the view that Good Friday was originally God’s Friday.