Something you should be aware of if going through the name databases is that the first names in the culture file are not actually used apart from for custom countries.
In normal play the first names will be taken from the country files instead.
Advisors take their name from a country list for the countries that have cores on their home province for instance.
The listed names with the odds "0" in the country file are never going to be used for rulers, and those with a negative number are treated as female names.
The "leader names" in the country file are last names used for advisors, merchants, diplomats and generals.
The dynasty names in the culture file are only used for pretenders and rulers with new random dynasties (again unless you play custom countries, if so then the dynasty lists are used for last names instead).
In general we don't spend much time on the custom country exclusive lists (they are pretty horrible in some places even for English culture and in Scandinavia) so I am much more interested in feedback on the (quite old) name lists in the country files.