User Conflict- Mavericks My home folder is called admin. However, I am signed in as John and there is no admin user. John is an administrative user.
Shouldn't the home folder show the signed-in user name? 

This may or may not be something I caused 


had another MacBook Pro crash, and this issue has arisen on replacement MacBook Pro and download from JustCloud 
which, among other things, has UPDATED every file to the download date!- among other download issues. 


I was having duplicate Desktop issues, including a user home folder Harry (also not showing in the Users preference pane.

Re-installed Mavericks, and this seemed to fix the home directory issue and that user issue. No more Harry and no more duplicate desktops. 

But, now "admin" appears seemingly out of nowhere.
The easiest way would be to create new user with admin privileges and delete all others.

That should get rid off the unwanted.

You can try rebuilding your user account as described here.