I used react-native init MyApp to initialise a new React Native app.
This created among others an Android project with the package com.myapp.
Go to file android/app/src/main/AndroidManifest.xml -
Update :
attr android:label of Element application as :
Old value - android:label="@string/app_name"
New Value - android:label="(string you want to put)"
and
attr android:label of Element activity as :
Old value - android:label="@string/app_name"
New Value - android:label="(string you want to put)"
Worked for me, hopefully it will help.