Thread:Morganstedmanms/@comment-30112702-20190601034946/@comment-39818304-20190615151111

It doesn't make sense anyway, since "opp" is an American English slang. As an Italian, for me it's pretty easy to see why Araki named him "Doppio" (double) even if masked as a classic food-related name "Double Vinegar" (similar to "double mozzarella" even if in Italy we don't have any "double vinegar" option in food): it's a BIG hint on the Boss' real nature. When Diavolo says "Doppio, mio Doppio" ("Doppio, my Doppio") to me it can also sound like "Doppio, [that you are] my double".

So I think that the opp/Dio thing is just a simple coincidence :)