It depends on what you are trying to achieve. If you want to change the name of the application that appears in the mobile phone menu along with the application icon, you must change it android:label
in android/app/src/main/AndroidManifest.xml
(example code 1) and CFBundleName
in ios/Runner/Info.plist
(example code 2).
The last time I did this, it took me years to find out why the name of the application was not changed in the list of running applications on Android. To do this, you also need to change the title of your MaterialApp (Code Example 3).
, . , . " " pubspec.yaml
, , .
1:
<application
android:name="io.flutter.app.FlutterApplication"
android:label="New Name"
android:icon="@mipmap/ic_launcher">
2:
<key>CFBundleName</key>
<string>New Name</string>
3:
return new MaterialApp(
title: 'New Name'
...);