How do I transfer remaining iPad Pro AppleCare plus to my name?

You will need assistance from the previous owner. See instructions in Transfer your AppleCare plan - Apple Support

babowa wrote:

You needto call Apple at 800-275-2273 and ask to be transferred to the Applecare division. Although Applecare is registered to a serial number, it makes things easier if it also has the correct name.

That may work too!

I have successfully transferred Applecare as a buyer without the seller's assistance. And, Apple has told me that the name is actually not imperative since the plan is registered to a product's serial number, not a person.

You needto call Apple at 800-275-2273 and ask to be transferred to the Applecare division. Although Applecare is registered to a serial number, it makes things easier if it also has the correct name.

Thanks -- good to know (if I can remember next time it comes up).