i:0#.f|mName|accountname mName = membershipprovideraliasinCentralAdmin accountname = account in Active Directory You would need to run a PowerShell command for the –Web parameter being the SiteCollection URL. You would need to login to that Site Collection at least once for the script to update the Display Name. This is something like alerts on a site will work for the user if we would have logged into that site collection at least once. Set-SPUser “ i:0#.f|mName|accountname” -Web http://sp2010/ -DisplayName "User Name"