They do this with macOS too. For example Lion -> Mountain Lion, or Yosemite -> El Capitan.
I think that macOS releases that focus on “stability” have some permutation of the previous release’s name. For example, Mountain Lion still has “Lion” in the name, and “El Capitan” is a formation within the Yosemite national park.
Does Sundar go in for these backdoor shennanigans?