I keep the file names as the DVD code and handle actor name searches by the database field.
Field value could be Star 1, Star 2, Star3, Star 4
(yes the field is actor names separated by commas)
Query would be Star like ‘%Star 3%’
That would return any title that has Star 1 anywhere in the name field, either all by herself or in a title with multiple JAV stars
What about Stars who change their name? Like Kurea Hasumi, there's even some with 4 alias