change the user's identity on AirPods
Given AirPods to my sister, want to change identity to her name
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On your iPhone tap on:
Settings > Bluetooth > [the circled i next to AirPods name] > Forget This Device
Then (to be sure they are removed from your account), with a web browser, go to: https://www.iCloud.com and sign in with your Apple ID. Open Find My iPhone and select All Devices (at the top). Then click your AirPods. Finally click "X" next to remove your AirPods. (If they don't appear, that's OK - just skip this step.)
Now your sister should be able to setup the AirPods with her Apple ID account.
Connect your AirPods and AirPods Pro to your iPhone - Apple Support