How do I change the Apple ID name on my iPad?

Go to settings>general>about>name.

Change the name of your iPad - Apple Support

for the name showing next to your picture in setting go to

settings-profile-name- edit

for  I’d

Same process just choose second option ( contactable at ) EDIT add new iCloud I’d or the service you use.

Your AppleID is not device specific. Your AppleID is your login ID for Apple on,one services and it will always be the same on all the devices you use with your AppleID.

The device name can be changed. But your AppleID will always be the same on all your devices.