How can I change the display name that my Garmin watch uses to address me?

My Garmin Lily 2 watch insists on calling me by my full name in the morning report and any other time it addresses me, which is annoying because it has to slowly scroll through the whole thing before it continues to the next screen. I cannot figure out how to change this.

  • On the phone itself, I can click into "Settings -> User Profile," and there is a menu that includes VO2 Max, Fitness Age, Display Name, and Wrist (placement). I can click on every other one of these to edit it or see more about it except "Display Name," which does nothing.
  • I've logged onto the Garmin Connect app and in "Settings -> Profile & Privacy," I've set it to my first name only. This does not change it on the watch.
  • I've gone to manage my account at Garmin.com and also set the name there in the "Profile" to be my first name only. Again, it does not change on the watch.

Where is the setting/option to change what the watch refers to as "Display Name"?