JAVASCRIPT

react native change app name

Android
1. Modify displayName in app.json file
2. Modify app_name in android/app/src/main/res/values/strings.xml
3. cd android -> ./gradlew clean
4. cd .. -> react-native run-android
IOS
1. Modify Display Name in Project target (General Tab) 
2. Or in info.plist file string value of CFBundleDisplayName key

change react native app name

android:
android/app/src/main/res/values/string.xml > change APP_NAME.

ios:
ios/[currentName].xcodeproj/project.pbxproj > change PRODUCT_NAME in debug and release. 
or
go to ios/[currentName]/info.plist
<key>CFBundleDisplayName</key>
<string>${PRODUCT_NAME}</string>

change app name in react native android

To change the name of the react-native Application

1 . Open ./android/app/src/main/java/[multiple folders]/MainActivity.java

 @Override
  protected String getMainComponentName() {
    return "NameOfTheApp";
  }
Open android/app/src/main/res/values/strings.xml

NEW APP NAME

Change Name in App.json and package.json.

4.For clean android project run following command

cd android &&./gradlew clean

how to set app name in react native ios

{
    "name": "SomethingSomething",
    "displayName": "My New App Name"
}