Surely you mean "Microsoft 365 Copilot"?
(I am not making this up. That is what it is called now.)
Realistically, though, I think pretty much _all_ office suites have been called [Something] Office, for about the last 30 years. The Google one ("Google Workplace", formerly "Google Apps") is the only exception I can think of, and I wouldn't necessarily take Google's lead in software branding (honestly, until I looked it up for this post, I thought it was still called Google Apps, and I use the damn thing every day).