When editing your iOS app's Info.plist file, you may have noticed two similarly named fields: Bundle Name and Bundle Display Name. This naming can lead to some confusion, but the difference between the two keys is actually quite simple.
The Bundle Display Name is the name of your app that users are going to see most of the time. The display name is shown on the iOS home screen, Settings app and Apple Watch launch screen.
The Bundle Name is your app's "short name". This name should be less that 16 characters long and is useful in space-constrained contexts. The Bundle Name is displayed in the menu bar or the application's info window.