I get that it's annoying, but also don't know what else one would do? "FooPilot is our Office AI toolset, BarWonk is our code assist tool"? There are also a lot of Claudes and GPTs. Naming things is hard.
To my understanding, Office (or "Microsoft 365") itself becoming "Copilot" was just confused messaging about the "Office Hub" app/shortcut being repurposed.