(OP's language was Ruby) re-raised there as an issue

Python: missing from preloaded import FIRST_NAME, SURNAME in solution setup

unfortunately, kata ranks cannot be changed

Not explained properly. Very simple problem but just because not explained properly creates too much ambiguity. You get confused in where you have the list of generated names.

Explanation For Beginners:
You have 4 inputs:
--- 2 objects provided by default (in background) from which you get generated names: 'firstName' and 'surname'
--- 2 inputs from which you get input Alphabets: first, last