Sorry, I did not see the "l" in your first post. I would assume that Duanel is a blend of
Duane with
Daniel, not
Juan with
Daniel.
Here is a link to the home page of a graduate student in Latin American studies at Princeton named Duanel. Perhaps you could contact him and ask him why his parents chose the name.
http://spo.princeton.edu/index.php?app=people&id=117