Requisite pointer to "Falsehoods Programmers Believe About Names" (https://news.ycombinator.com/item?id=1438472 from 12 years ago; use HN search if you want to see the more recent threads).

If you've ever seen "FNU" as an Uber driver's name, that's a consequence of the _US gov't_ enforcing rules like this; it stands for "First Name Unknown".