This is a great site - I stumbled upon it by googling around. I am from the Enix's in the Akron, Ohio area. My grandfather was William Otis Enix and my father is Dennis Dale Enix (Dale).
The story of the Enix name orgin has always been that it was a American Indian name - possibly Creek or Cherokee. I never have found any proof of this but there is certainly the enix root in the word Phoenix, which is commonly known as the firery bird and used to represent rebirth.
God Bless you all in the search and may we all represent the name well!
Dennis - Louisville, KY