As mentioned above, you wish to make the field name appear on the form field and replace it with user input.
There is no default option in Acrobat for that. However, you may try adding the "Tooltip" under the Form field properties window > General Tab. However, you may try a workaround. You may enter the field name as text in the field at your end, and then it can be replaced by the user input.
You may check if it can be achieved using a script.