Help IPHONE 6 plus issue! Erased but my custom iPhone name is still there when plug into iTunes after erasing?

I plugged into another computer the phone has never been used with and still has the custom name. I want to restore the name to the factory default name of the iPhone whichever that is, I feel the phone isn't truly erased with the name still there. Can't sell until I fix this issue!

Settings-General-about-name.

If you want the iPhone erasedCompletely. Make sure your phone is completely signed out of your Apple ID in settings. It's at the top of settings so it's hard to miss. Then choose the restore button in iTunes while your phone is connected to it. That will completely erased everything including the software and reinstall it fresh. If successful don't even bother setting it up again.