Is it pronounced dune or June?
In American English, the words dune and tuna are pronounced doon and toona. In UK English the U is expressed as YOO, making the pronunciation of the words dyoon and tyoona. Neither a J nor a CH sound should be heard in either instance.
Why is dune pronounced June?
Younger speakers are far more likely to blend the consonant and <y> sounds into a <ch> and <j> sound respectively. Thus the word tune might sound something like 'choon' and the word dune might be pronounced like June.
Is Dune American or British?
Dune (titled onscreen as Dune: Part One) is a 2021 American epic science fiction film directed by Denis Villeneuve from a screenplay by Villeneuve, Jon Spaihts, and Eric Roth.