John D'addario addresses this in part of an interview...but adds to the confusion.
John sez to use the common nursery rhyme phrase "Hi-Ho-The-Derry-O" to get the name right. It is thus pronounced "duh-Derry-O". However, even he softens the entry "duh" to where you can hardly tell it is there. At the end of the video, he sounds like he's saying "Derry-O".
The larger point here is that reviewers/critics need to get it right...or their review/critique is immediately faulted.
Consult the outrage experts on Twatter and Instagripe. The can help you sort it out.