And first names, which causes some government agencies to put FNU in that field for "first name unknown".

My mom told me about a time they had someone with that situation at work, and people would call the person FNU until they were corrected.

Or NMI for nor middle initial, I think I've heard of stuff like NA, too...

And more and more:

https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-...

FI²N sounds like a nice first name (Fuck If I Know)

Well if you have one name, that's your last name.

I assume you're making a joke. In any case, no that's not true. Because if it's your first and last name and you type it in both fields, you are now screwed in a different way.