prevent Lock Screen from showing user FullName Is there any way to prevent the lock screen from displaying my full name?    

It's a privacy matter and I would like to keep my personal data away from other people.
I know I can turn my screen off, but if someone tries to unlock my computer, she/he will be able to read my Surname.
It's also a Company machine, so I have to keep my full name in the system settings, I cannot change the name within the system.   

I would only like to not show the user surname in the lockscreen.    

Can it be done?
Try this in Terminal

sudo defaults write /Library/Preferences/com.apple.loginwindow HiddenUsersList -array-add user1 user2 user3 user4


Change user1 and/or user2 ect. to actual user name

If there is only one user drop the others