Way back in 1986.
Back in 1984/5 I had a couple of TF nicknames, in our TF group everyone had a nickname. I had "Spike" due to my spiky hair, and "Mixmaster" to closely match my real name (Mitchell), thus AKA "Mitch-Master / Mixmaster", but none of my friends wanted to call me
master. That would have been cool.
Alas 1986 rolled around and Metroplex was introduced. My buds had to choose between "Mitch-master" or "Mitchellplex". As you can see, Metroplex was voted to be my official nickname.
Fast forward to 1999, I tried signing up for
metroplex@hotmail.com, but some other nerd took it. So I had to add the birth year.
Sidenote: when I was playing Starcraft online, my short name dubbed by teammates was "M79", which sounds like a weapon....or a deadly gas.