Computers with Ethernet (hardwire) showing old Internet Name

[ConnectMePlease]

Over the past couple years we've had issues with our internet and changed our wifi name and password multiple times. Recently we decided to hardwire our computers into the RAX48 with ethernet cords. For some reason all 3 computers are showing up with different (old) network names. How can I remove old IP address (and old network names) from our router? 

[plemans]

Its how windows is naming them. 

https://www.howtogeek.com/364291/how-to-change-or-rename-the-active-network-profile-name-in-windows-...