quarantine 'em

Just to start with, changing your name involves filling in a form. So it has to be possible to write it. Can't be (solely) a gesture

The same way "schemaless" databases *do* have schemas, but implicit ones defined by the applications wrapped around them

...but if there *is* a schema for legal names, organisations can be held accountable when they fail to handle them correctly

"You can't handle people named 'Null'. This violates EU law. Fix system or you may no longer sell flights here. You have 28 days."

Must names be expressible in any kind of binary encoding? Must they be textual? Is pictorial/spoken acceptable? What about sign names?

Just getting started on answering this question probably necessitates an organisation as large and complex as the Unicode Consortium

To say nothing of the anonymous

Plus, we treat constraints as challenges. No matter what schema you choose, it will always be possible to invent a name outside of it