My family like to accuse me of pedantry, and I
do like to get things right when I can.
However, ultimately, remember you are using these rules so that you can find your authors in Calibre. So, if you know - or can find - the rule for any given name, by all means use it. It is then up to you to remember what you have used.
If you do not, then make it up. It is still up to you to remember what you have used.