I've never worked with the names-related files, but after seeing how it works with other files with the same structure I can guess that the names included in descr_names.txt must fit exactly with those in descr_names_lookup.txt. I mean, all the names that appear in one file must be included in the other one.
Moreover, all those names must be "translated" in Data\text\names.txt.
Did you check the exact correspondence between the three files?

Because of that it would be advisable to start by adding only one name in the three files. When it works, deleting one name and advancing in such a slow but secure way.

Good luck!