Since uninstalling and reinstalling the mail.com app didn't help, try these steps on your Android device:

1. Clear app cache and data:
- Go to Settings > Apps > Find and select the mail.com app.
- Tap Storage > Clear Cache and then Clear Data.
- Restart the app and try again.

2. Check for app updates:
- Open the Google Play Store.
- Search for mail.com app and update it if available.

3. Restart your device:
- Sometimes a simple restart can fix app crashes.

4. Check device storage and permissions:
- Ensure your device has enough free space.
- In Settings > Apps > mail.com app > Permissions, grant the necessary permissions.

If the problem persists after these steps, try contacting mail.com support for more specific assistance, as the issue might be app-specific on Android.

Since the issue occurs when accessing account name settings, it's less likely a general app crash but possibly linked to your account data or app version causing instability. Clearing app data and updating the app usually helps resolve this.

Note: The provided troubleshooting is adapted for Android devices since instructions for macOS won't apply here1 3.