The latest release of Android Messages app from Google had just hit the playstore featuring Material Theme. I was able to trace back the internal codenames of the app. You can check out part 2 and part 3 of this series as well. The code names are part of the application version name from version code 2.1 and up and they are. They seem to be related to music, most of them being musical instruments from different parts of the world. Naqara Ocarina Piccolo Ramwong Sarangi Tuba Ukelele Vuvuzela Whistle Xylophone Yehu (Version 3.4) Zither (Version 3.5) Another interesting thing to note is that they have reached code name with Z and we have to wait and see what code name they would be using for the next version. Either restart with A or maybe use a new theme. As a side note, Google Play Music app just has an alphabet as code along with version number, that has circled past Z atleast once. UPDATE (10/10/2018): Version 3.6 of Android Messages is now released with the code name “Nose Flute”, another musical instrument.