You can manually change a macOS device's hostname by:
1. On the physical device open "System Preferences".
2. Click "Sharing".
3. Click the "Edit" button underneath the computer name field.
4. Use the pop up field to change the Local Hostname. Then click "OK".
🌟 Fleetsmith will reflect the updated hostname in the UI the next time the device checks into the Fleetsmith web app.