Any sitcom with a few seasons under its belt is inevitably going to have a roster of running gags built up. On Superstore, the series longest-standing running gag was Amy wearing random name tags, which started in the first episode and ran right until she left the series.
Amy Sosa, who started the series as Amy Dubanowski, had been working for Cloud 9 Store 1217 in St. Louis, Missouri since 2003. It wasn't the best job in the world, but it provided her with a solid income to support her husband and daughter. Plus, Amy kind of ended up in a "devil she knew" situation, where she at least knew what she was getting from Cloud 9's corporate masters. Really, it was the fear of the unknown that kept her there.
When Jonah Simms joined the staff in Season 1, Episode 1, he noticed that Amy's name tag didn't have her name on it. Amy explained that she never wore a name tag with her real name on it because she didn't want any Cloud 9 customers to know it. Given the people that generally shopped in the store, it became evident quite quickly that Amy made the right call.
Name tags are a persistent part of minimum wage jobs like the ones depicted in Superstore. As Wayne Campbell said in the first Wayne's World movie, "I've had plenty of joe-jobs, nothing I'd call a career. Let me put it this way: I have an extensive collection of name tags and hairnets." There are a lot of people in the world who can identify with that sentiment.
But one aspect of the minimum wage service industry that Amy correctly identified is that some customers will weaponize an employee's name against them to get what they want. It becomes a tool in threats to contact managers and bully employees in the store. While some complaints are valid, there are also a lot of "Karens" who have no issues using an employee's identity to get what they want, no matter how unreasonable.
As such, Amy wore a different name tag in almost every Superstore episode. They belonged to former employees or to employees who weren't on shift at the same time as Amy. In some cases, they were just random names that belonged to no one at Cloud 9. All that mattered was that Amy could not be identified by the people who shopped at the store.
While a couple of names did get repeated, she only wore a name tag that read "Amy" on three occasions across the 102 episodes her character appeared in. That's pretty impressive when examined from a distance. She even continued this practice once she became the store's manager. And it obviously didn't bother the suits at Cloud 9 at all as she kept getting promoted. In a strange way, Amy was honest about herself in this running gag, and people responded.