So every person needs to be able to read every single script? Cyrillic? Greek? All the variants of CJK characters' reading in people's names? Practically ASCII is enough for information interchange and I say this as someone from a country that doesn't use Latin script. By all means record "name as spelled by person in native script" as a completely freeform string, but in practise we also need "name as spelled using ASCII so everyone can read it".