applications – How to find the files (.apk) of a certain app like Google Play Services

I have a rooted device and I tried the find / -name "*Play*" command and got some files from and a couple of Playlists but nothing like Google Play Services.apk

I wonder if it is possible for an app to not have an .apk file and if this is the case is there any chance of finding the files associated with the app from the app name?