Heck, some fans (or maybe just I (but even if I'm not alone I'm defo in a minority)) still tend to call her Uika more than Hatsune
Yeah, I'm not super involved with the fandom but I feel like everyone I've seen still calls her Uika, and that's basically the name that she became for the sake of getting close to Sakiko, and again still uses with friends. So it feels reasonable to call her that name in my opinion. Especially with how the reveal pretty much just ends on "okay moving on, back to being a band".