Admittedly I don't play on Xbox, but yeah their console naming is baffling to me and I honestly don't know/can't be bothered to figure it out. PlayStation is simple. Bigger numbers equal newer. Pro version? Just a modest step up but still clearly identifies as the same Gen.
When Xbox launched the One, I thought, "oh they're going to reset the numbering convention. It's awkward now but will be easier going forward." Boy was I wrong.
On the other end there's Nintendo, but the names are so different and distinct it's easy enough to distinguish (except whatever the hell Wii U was).
Microsoft seems caught in the middle. They clearly didn't want to be like PlayStation, but they don't want to/can't come up with unique names, so you get just a mouthful of nonsense letters and numbers.