Xbox One
Xbox
Xbox Series X/S
Xbox One X/S
Xbox 360
They all had "Xbox Live!" more usually written Xbox LIVE
At work I like to joke that any new product coming out from Microsoft should be renamed "Azure DevOps", since their goal appears to be confusion.
With you 100%, nobody's worse at naming things than Microsoft. I'd say the only real contender for its throne is Google with its Messages/Allo/Duo/Hangouts Chat/Hangouts Meet/Google Chat.
Also Skype, that is sometimes called Lynx, or Skype for Business.
They rebranded it when they bought Skype because everyone hated Lync so much.
Which... to be fair, Lync is the only application I've known that's dumb enough to repeat failed login attempts with the same incorrect credential until the account is locked.
Found out when I'd rotate my AD password and a box I was remoted into would promptly lock my account by trying to use the old cached auth.
Oh.