watchOS doesn't have public code names the way macOS does, but it does have internal code names — and they're beach-ing!

Apple doesn't use public code names for watchOS the way the company does for the currently California-landmark dubbed macOS Sierra. It does use internal code names, though. The Apple Watch itself was code names Gizmo, but for watchOS, it's all based on beaches.

  • 2.0: Bondi
  • 2.2: Coral
  • 3.0: Daytona

More code names

Via: iPhone Wiki