By default the display name for the app is set to Houzi. For Android, you can change it in AndroidManifest.xml. For iOS, you can change it in info.plist.
Open AndroidStudio, expand
android > app > src > main project folder, and find AndroidManifest.xml
Look for the application tag, and replace android:label attribute with your own display name.
open Xcode, and click on the project name (Runner) on the top left side and click on Info tab, you should see the Bundle Identifier option, change its value with your own.
Project_HOME > ios > Runner > Info > Bundle Name
Replace Bundle Name value with your display name.Previous: Changing App Icon Next: App bundle identifier & version