By default, your Mevo will be named along with its serial number (e.g. "Mevo-00123"). If you wish, you can change this name.
Go to 'More Options,' and then tap the gearwheel to open Settings.
You will notice your Mevo's name at the top of the menu. Tap the pencil icon next to it to edit its name (you will notice a keyboard appear).
When you type in a new name, tap the blue 'Done' button at the bottom of the keyboard.
Your Mevo is now renamed.