I have recently started a free space project for the Popes, and am trying to establish a guideline for how to enter names. Traditionally when Popes take the office, they choose a new name for their reign. This name may include a roman numeral suffix to indicate how many Popes before have held that name.
General guidelines would have Pope go in the prefix field, the number in the suffix field and the papal name in either the preferred name or nickname field. This creates an odd mixing that would not be seen in other contexts, certainly never how they would have used it.
Pope Karol (John Paul) Josef Wojtyla II
Karol (Pope John Paul II) Josef Wojtyla
This is the resulting display of having both the prefix and the suffix in the nickname field. I personally find this preferable as it keeps the prefix and suffix with the name they go with. I also find it preferable over a third style:
Pope John Paul II Josef Wojtyla
Where the new name is in the preferred name field obscuring the given first name in some contexts.
Currently all three styles are being used, is my suggested alternative style a reasonable exception. I am certainly open to other ideas on how to display these names well if anyone has any.