A "fake name" is a made-up or false name that someone uses instead of their real name. It is used to hide their true identity or for privacy reasons. Full definition
The stories were not clear on what the actual «fraud» was, other than using fake names for himself. (biggerpockets.com)
The employees for this company are not real and are listed with fake names while their photographs and content have been lifted from other websites online. (fxstreet.com)
Whatever you call them, the fact remains that countless famous people have historically been mostly known by fake names. (elearningindustry.com)