First check the current instance name by running these two queries:

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select @@servername
sp_helpserver

Then to actually change this instance name run the following query. Make sure to update ‘old_instance_name’ and ‘new_instance_name’ accordingly:

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sp_dropserver 'old_instance_name'
go
sp_addserver 'new_instance_name','local'
go

Restart the SQL service in order to apply this change. Then confirm it took effect by running the two queries mentioned above:

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2
select @@servername
sp_helpserver

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