I needed to change my legal name because my existing one was unavoidable and distressing (trans reasons). I have, have had, and will have too many names to privilege one as "most correct." I've been trans too long to believe government names are "real" anyways, and I also didn't want the association with my birth family anymore. so I wanted an "empty" legal name, something that nobody calls me (but I won't be upset when doctors do), something that represents the rejection of the ultimate validity of itself, and something that sounds cool. I also like being just mildly annoying. $redacted_firstname Null fit.
The funny thing is, the real thing that's caused me problems is that I changed from a name with a middle name to one without. Some systems did not handle this transition well. PATCH instead of PUT, or something.