Calling the day of the Crucifixion 'Good' Friday is a designation that is peculiar to the English language. In German, for example, it is called Karfreitag. The Kar part is an obsolete word, the ancestor of the English word care in the sense of cares and woes, and it meant mourning. So in German, it is Mourning Friday. And that is what the disciples did on that day - they mourned. They thought all was lost. And in Chinese, for another example, it is called the Suffering Day.  And that is what Jesus did on that day - He suffered for our sins.

There are a number of cases in set phrases where the words God and good got switched around. One case was the phrase God be with you, which today is just good-bye. So perhaps Good Friday was originally God's Friday. Or maybe people call it Good Friday because, in pious retrospect, all that tragedy brought about the greatest good there could be.

We can see virtue in either terminology. If we call it Mourning Friday (as in German), or Suffering Day (as in Chinese), we are facing reality head on, taking up the cross if you will, fully conscious that the Christian walk is seldom a casual stroll in the park. But if we call it Good Friday, as in English, we are confessing the hope that no tragedy-not even death-can overwhelm God's providence, love, and grace. Either way seems fine.   

God be with you.