I need to have a completed field auto filled later in the pdf

Fields with the same field name and type share the same value. If you need the patient name read only on the other pages then you need to use a different field name for the field on the subsequet pages and a custom JavaScript to update the second form field(s).

I would use the input form field's "Action" of On Blur" to run the following script:'

this.getField("LockedNameField").value = event.value;

You may need to change the :LockedNameField" to the name of the other field.