In DC Extended Universe, Wonder Woman made three appearances till now but I never noticed anybody referring to her as Wonder Woman.
Did I miss something or she is not even Wonder Woman in DC Extended Universe?
Because it is not the name she was given or known by in DCEU. Amazons call her Diana. Steve gives her name Diana Prince when they went to assembly. This name is used by everyone else later.
However the name Wonder Woman is only for audience.
There is another thing that nobody knows this name of her. We only see the logo WW on Lex Luthor file, so maybe he gave her that name, but nobody knows it except him yet.