With this little line you can get the DisplayName and whatnot from the AD, if you only happen to have the account id or logon name:
get-qaduser [logonname] | ft samaccountname, DisplayName, Title, Department
If you are about to do a bulk conversion, a textfile(users.txt) containing the logons might be easier.
Get-Content .\users.txt | get-qaduser | ft samaccountname, DisplayName, Title, Department