[MZMegaZone]

Short answer: Badly.

Long answer: Most DBs key on lastname, so MegaZone is my last name, officially, and I have no first name. Then I leave the first name blank if it'll let me, but more often I need to put something in there - so these days I use 'MZ' as that's what I have people call me. I used to use 'Mr', and I still need to use that on some government forms so everything will match up.

[theogravity]

On official gov documents like ID / Passport, does it read:

First Name: Mr Last Name: MegaZone

based on what you stated? I figure that gov forms would always require a first / last entry.

[MZMegaZone]

License and passport have no first name and MegaZone for a last name.

My SSN Card has 'Mr MegaZone' - when I changed it, back in 2000, the SSA said their computers just could not handle a blank first name. They wanted to put in something like NFN MegaZone, FNU MegaZone, etc. (No First Name, First Name Unknown) I suggested 'Mr' because it tickled me to make the government call me Mister MegaZone. ;-)

Airline tickets are something where I use Mr MegaZone. I have Global Entry/PreCheck, and even though my IDs have no first name, the ticketing systems do NOT like that. So my PreCheck stuff is under Mr MegaZone. I made the mistake if booking once under MZ MegaZone, and even though all my PreCheck info was on there, it didn't work and I got stuck in the normal security line. Lesson learned.

My passport does break other systems sometimes - I go on cruises with my wife and they, of course, base things on your passport. So I usually end up as FNU MegaZone, which leads to hilarity as crew members try to pronounce 'FNU' as a name. Usually once I'm onboard I can get into the system and edit things, but such is life.