https://techcrunch.com/2017/08/21/android-o-is-officially-called-android-oreo/

The latest version of Android is officially here, and it’s called Android Oreo, as most people suspected. Google made the interesting decision to reveal the final name and consumer launch details of Android 8.0 coincidentally with the arrival of the solar eclipse over NYC, which is where it held its launch live stream today.

Google has traditionally used sweet treats for the names of its major Android releases, dating back to Android 1.5, aka “Cupcake.” KitKat (4.4) was the last branded release, with Google typically sticking to generic dessert names wherever possible. Oreo is pretty much the only choice for an “O” dessert that’s broadly and instantly recognizable, however, so it seems like it was almost inevitable.