Online Device names in Norton Account

I have Norton Internet Security installed on five computers on my network. When I go into my Norton online account, I see the five devices listed with the following names:

     Robert-Windows 7

     Robert-Windows 7-1

     Robert-Windows 7-2

     Robert-Windows 7-3

     Robert-Windows 7-4

     Robert-Windows XP

I would like to change those names to better identify the actual computers, but I don't know which computer each one matches, and there is nothing on the computers themselves that matches up with this. Not even the Windows XP matches, because I am running Windows 10 on two of my computers and Windows 7 an the others. How can I establish the connection of each item on the list with the actual computers, so that I can assign meaningful names?
Bob