Board Thread:Questions and Answers/@comment-1085911-20160418090211/@comment-1618941-20160418092812

AnnabellRice wrote: Neither was referred to by codenames during the two films in which they've appeared; however in Avengers: Age of Ultron the characters were credited as Quicksilver and Scarlet Witch despite never actually being called by those names on screen.

This is patently untrue. From the start of the feature, through the text of the credit crawl, neither comic book alias was ever used.