Eli5: Why monarchs have numbers in their names to keep them distinct, why can’t they have a different name?

Question

like why king xyz 2 and not some other name
?

In: 72

Answer 1

Imagine when you have a child, having to go back through your family history and check all the names that have already been used so you don’t repeat any, because you can’t use the same name as any of your ancestors.

No, me neither.