Microslop's naming scheme has always been completely insane, its like their marketing department is a six year old child. You give them the new word you want to show up often, and instead of thinking of natural ways to implement it, they just fucking shove the word everywhere.

"Copilot" is the word now, so "Microsoft 365 Copilot", a sequence of words that mean absolutely nothing, replaces "Microsoft Office" which is one of the most well known and memorable software names ever.