Change NetBIOS name

I have a couple of computers that the description name is one way and the full computer name is another.

For example.     The description is GLD123 but the full computer name is GLD123-HP.doman.local

I want to change the full computer name to match the description as with the rest of our computers.   I read that this is the NetBIOS name that I want to change.
How can I change it.     It's just a annoyance since it's not done as all our other computers are done.    
Do I need to unjoin it from the domain and then add it back?
It won't let me just change the computer name.   It says the account already exists.
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To be able to accomplish this you have to dis/unjoin the computer from the domain indeed.
After that you could reboot it or try to immediately change the computername.
Then reboot it and join the computer to the domain and reboot it another time.

Also please make sure that you delete the old computer object from Active Directory.
And that you move the new computer object to the same Organizational Unit as the current one.
Also make sure that after the renaming the computer is registered correctly in DNS.

The name is indeed the NetBIOS computer name most of the time referred as computername.

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