Changing the computer name in OSX is really simple. Perhaps you bought a used machine or you’re just tired of the current name of your OSX machine. It’s a simple process so let’s learn how to do it. The location of your machine name might not seem very intuitive; at first you would probably expect for it to be located under general or computer preferences. Well it is and it isn’t. First open up your “system preferences.”
Then browse down to the Internet & Wireless section.
Click on Sharing.
Once you’ve done that you will see the first text box on the screen contains your current computer name. Just type in your new one and hit the “x” to close the screen which also auto saves your changes. No need to reboot, you’re done!