If I've understood your question correctly, you want to force all titles everywhere in the world to be named after families.
Unfortunately, the game rule
"titles named after dynasties" only has two states: off and on. And, if you read the documentation on the wiki, neither of those are what you're looking for.
So, while you can easily change game rule settings (and edit them in existing save files), it's not going to help you in this case, because the game doesn't support the feature you want.
What you'll need to do instead is create a
mod where you manually add
dynasty_title_names = yes
to every culture.
Alternatively, it's possible that someone already made the necessary mod, in which case you could simply download and install it. However, I did a quick search on the workshop but couldn't see anything.