He-Who-Must-Not-Be-Named's full name isn't spoken aloud often in the Harry Potter series, but when it is, it's typically pronounced the same: with a full and robust T on the end, Vol-de-mort. But that's not exactly how the creator of Harry Potter, J.K. Rowling, says it.
... but I'm pretty sure I'm the only person who pronounces it that way. https://t.co/HxhJ5XY5HP— J.K. Rowling (@jk_rowling) September 9, 2015
Any confusion on the part of fans is understandable, given the films themselves side with this apparently incorrect pronunciation.
But, then again, we've been warned.