Computer Hope

I have several devices using my Linksys E1200 router. I just added another device. In the section 'Wireless Client List', it shows up as 'DEFAULT'. I want to change that to something more descriptive, but I can't seem to find a way to do that. When I attempted to get around this issue by clicking 'Add' and manually re-adding the device, giving it a descriptive name, it wouldn't let me do that because that MAC address is already taken by that device. Even after removing the device from the Wireless Client List and then re-adding it manually doesn't work.