I don’t use Fairphone OS currently, so I can’t check, but there’s a chance you can see the package name of an App in Settings - Apps & notifications - (select your App) - (scroll to the bottom of the page, or tap “Advanced” and scroll to the bottom of the page).
Else … here’s a post from a while back including a list of some preinstalled packages and what they are … Google Apps keep reinstalling/ reactivating - #34 by AnotherElk