In Flutter Changing App Name or App Display Name is very easy. By default, the app name is your project name. To do that, follow these steps.
For Android
First, go to the android > app > src > main> AndroidManifest.xml
file.
Then, find <application>
and change its android:label
property with your desired app name.
<application
android:name="io.flutter.app.FlutterApplication"
android:label="your_app_name"
android:icon="@mipmap/ic_launcher">
For iOS
First, go to the ios>Runner>Info.plist file. Then change your app name.
<key>CFBundleName</key>
<string>your_app_name</string>
Then don’t forget to run flutter clean
and flutter pub get
command. Then uninstall your old app and run your project. That’s it.
Also read, how to remove debug banner in the flutter