Boris Gudenuf
Deity
I am pretty sure the only 'rule' for Leader's names is that they be as recognizable as possible in English and as distinct as possible within the game. Especially in Civ VII, where the Leader is the ONLY real continuity between the Ages and Civs you are playing.I wouldn't mind this at all (actually it would please my OCD greatly), but unfortunately Civ has been very inconsistent in their use of exonyms/endonyms.
I feel like certain leaders like Louis, Henry, Wilhelm, and Ivan should just have skin-swaps like the Koopalings in Smash Bros. Which Louis? Whichever Louis you want him to be.
That makes any multiple names with just nicknames or numbers attached a very marginal prospect, IMHO.
It also means, having Napoleon I in the game already, we are not likely to see Napoleon III or any other Bonapartery.
On the other hand, having Hatshepsut instead of Cleo No. 7 means one of my current favorites, Cleopatra of Epirus is still viable. One out of two ain't that bad.