I have purchased several Kindle’s over the years and when I pre ordered my Fire HD, it came with a generic name saying it’s my third. Changing it to something else is easy, here’s how.
Unlike renaming a Kindle Touch, you need to rename the Fire or Fire HD through your Amazon account online. Log in on the Amazon site and then click Manage Your Devices under the Your Kindle account section on the page.
On the next page you get a list of the Kindle’s you’ve registered. Next to your device’s name click Edit.
Now type in what you want to name your Kindle in the field provided, then click Update.
That’s it. Your Kindle Fire HD is renamed on the page and the next time you turn on the device you’ll see its new name.