Board Thread:Questions and Answers/@comment-1085911-20160418090211/@comment-16461120-20160418090743

It's potentially debatable, but the constant edit wars grow tiresome.

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.