Why does the "Computer Name" sometimes change?

                Not a big deal, just curious, why does the "computer name" sometimes change?
                 The name will be the same, but it will add a number....2,3,4...I always change it back so it doesn't have a numeric value next to it, but just wondering why it happens.
                                        Thanks.

Can also occur after your computer is put to sleep and then wakes back up or after your computer is force quit and immediately restarted. Sometimes the router 'believes' the computer is still connected when it actually isn't. When that computer re-establishes a connection the router 'tells' the computer that a computer with that name already exists so it has to change its name. By default a computer running MacOS adds a number (or increments its number) when this happens.

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