Set the hostname/computer name for macOS

Setting the Mac hostname or computer name from the terminal

1. Open a terminal.

2. Type the following command to change the primary hostname of your Mac:
   This is your fully qualified hostname, for example myMac.domain.com

   sudo scutil --set HostName <new host name>
   

3. Type the following command to change the Bonjour hostname of your Mac:
   This is the name usable on the local network, for example myMac.local.

   sudo scutil --set LocalHostName <new host name>
   

4. If you also want to change the computer name, type the following command:
   This is the user-friendly computer name you see in Finder, for example myMac.

   sudo scutil --set ComputerName <new name>
   

5. Flush the DNS cache by typing:

   dscacheutil -flushcache
   

6. Restart your Mac.

You can set the computer name in System Preferences → Sharing.