That would be St. Peter in the Bible.
He is 51 years old and gray hair in the fuller family.
It's a corruption of 'for pity's sake'.
You could say "What in the name of Mike!!"
Well im guessing pete did
According to the Related Link: "This phrase and phrases like "for Pete's sake" are euphemisms for the phrases "for the love of God/Christ" or "for God's/Christ's sake" and hail from a time when those...