There are several possibilities:
1- The use of a package:
I suggest you to use flutter_launcher_name because of the command-line tool which simplifies the task of updating your Flutter app's launcher name.
Usage:
Add your Flutter Launcher name configuration to your pubspec.yaml file:
dev_dependencies:
flutter_launcher_name: "^0.0.1"
flutter_launcher_name:
name: "yourNewAppLauncherName"
After setting up the configuration, all that is left to do is run the package.
flutter pub get
flutter pub run flutter_launcher_name:main
If you use this package, you don't need modify file AndroidManifest.xml or Info.plist.
2- Edit AndroidManifest.xml for Android and info.plist for iOS
For Android, edit only android:label value in the application tag in file AndroidManifest.xml located in the folder: android/app/src/main
Code:
<manifest xmlns:android="http://schemas.android.com/apk/res/android">
<application
android:name="io.flutter.app.FlutterApplication"
android:label="Your Application Name" //here
android:icon="@mipmap/ic_launcher">
<activity>
<!-- -->
</activity>
</application>
</manifest>
Screenshot:
For iOS, edit only the value inside the String tag in file Info.plist located in the folder ios/Runner .
Code:
<plist version="1.0">
<dict>
<key>CFBundleName</key>
<string>Your Application Name </string> //here
</dict>
</plist>
Screenshot:
Do a flutter clean and restart your application if you have a problem.