If a staff member for example has their name change after getting married, the name changes are done in Active Directory but the name shown on the Windows Login Screen does not change unless a new profile is created. Below are directions to update the name shown on the login screen.
Change Username (AD Account Username Teacher)
Change the AD Account name (This will sync over dirsync no issues with email)
Go to the computer login as administrator change the folder name under C:\Users
Go to regedit modify name of directory
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
Keep scrolling down until you find the one and then change it to the new name.