Ooooh this is a fun resource, thank you for sharing it! As you know: A list of people who don’t exist is actually a very valuable asset for us in terms of testing the overall scoring system - we can just assume that every row in this is a negative match against every sanctions list. These sort of “external truth” things have gotten us a lot of mileage already 
Regarding prefix removal on names, we’re actually doing a lot of build up on name reference data, including a prefix list here: rigour/resources/names/stopwords.yml at main · opensanctions/rigour · GitHub .. We need to make this more broadly findable at some point (check the org types file in the same folder).