If you have an machine name that
is invalid for SQL Server, Exchange, or just want to be cute, you
can change it in Control Panel / Networks, but that could be a
lot of work.
Create an alias instead, by editing:
HKEY_Local_Machine\System\CurrentControlSet\Services\LanmanServer\Parameters
Add Value: OptionalNames REG_SZ String:
"Alias"
If you make it a type
REG_MULTI_SZ, you can add multiple aliases.