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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:

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