You can change the name of your iPad or iPhone device on the Application itself.
Follow the steps below on how to change the device name:
Step 1 - By going to the app on the iPad and clicking the hamburger in the top left corner.
Step 2 - Then you will see a pencil icon under the current device name.
Step 3 - Click on the pencil icon and a pop-up will appear for you to rename the device.