Here you can find the information, you're looking for:
Two apps in Windows Store can't share the same name:
Each name that you reserve must be unique throughout the entire Store, not just in a particular language.
You are reserving the DisplayName
for your app:
When you submit your app to the Windows Store, the Package/Properties/DisplayName value must match the name that you reserved for your app in the Dashboard.
I'm not sure what you're refering to with "package name". The package Identity
does not match the DisplayName
but is created for you:
Before you can submit your app to the Windows Store, your app must also define the Name attribute of the Package/Identity element in the app manifest. This must be the package identity name that the Windows Store created for your app.