SharePoint User Profile Synchronization.

SharePoint portals are tightly integrated with Active Directory and since SharePoint has a additional Database to maintain user profiling, However many times user alias names are shown inconsistent on welcome.ascx section For some it's show :

•         first name , last name

•         last name, first name 

•         domain\userID 

 This means AD-Profile Synchronization is not enabled or not happening for some reasons.

SOLUTION:

Manually run following SharePoint PowerShell Command which synchronizes AD Accounts.

Get-SPUser –Web http://SharePointServer | Set-SPUser –SyncFromAD

Execute command for each Site collection to reflect these changes.