Change system names on macOS

From term (or equivalent), copy and paste:

To change your public Host Name (i.e., jeff.oozou.com): 
sudo scutil --set HostName "New Name" 

To change your local Host Name (i.e., jeff.local): 
sudo scutil --set LocalHostName "New Name"

To change your Finder Computer Name (i.e., Jeff's MBP): 
sudo scutil --set ComputerName "New Name"

Finally, flush your DNS cache to force refresh: 
dscacheutil -flushcache 

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