Help with name change

To change the name of your MacBook Air, use  (Apple menu) > System Preferences... > Sharing > Computer Name.

If you want to change the name of your macOS User Account, please follow these instructions: Change the name of your macOS user account ... - Apple Support

What names have you like thus far? Maybe we can use that as basis to give you some suggestions. (:

Open Sharing preferences. At the top you can edit the name field.