How to Find Your Mac Computer Name Step 1 Open System Preferences. Step 2 Click Sharing. Step 3 Your computer name will show and can be edited if you have sufficient rights. Note: Default setting is a letter dash then the serial number. If you edit it, keep in mind this is the name other users on the network will see. Warning: If you have a Mason-owned Mac, do not change your Mac's computer name. Last modified: September 20, 2018