PDF Formular Verknüpfung von Formularfeldern aufheben

You can use a script, but it can't directly rename the fields. It has to re-create them using the new names, and some settings (basically all the Actions associated with the fields) will be lost in the process.

You can do it using this (paid-for) tool I've developed, for example: https://www.try67.com/tool/acrobat-rename-duplicate-fields-to-unique-fields