Received msg that my MacBook is already in use and name changed to "Judys-MacBook-2.local"  Why would this happen?

When I opened my Mac I received a pop-up that "Judys MacBook" is already in use and name is now changed to "Judys-MacBook-2.local"
Can anyone explain why this would happen and if this is serious security issue? 

Sometimes the warning means that you have two simultaneous connections to the same local network: probably Ethernet and Wi-Fi. If applicable, disconnect the Ethernet cable or turn off Wi-Fi.
Sometimes a device that gets its network address from the router wakes from sleep, and the address it was using before has been assigned to another device.
A third-party wireless router that has incompatible settings or firmware may be the cause. In that case, refer to the manufacturer or ISP for support. Restarting the router may help, temporarily.
Rename the computer in the Sharing preference pane.

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