Simple. In the time before time, I made an account called Man.
An explanation for this was that my sister played Blockland as well, and I was stupid enough to believe she wasn't just humoring me.
She does that.
Man was the only username we could agree on.
So then I forgot Man's password, and made Man 2.
Didn't occur to me to consult support, though I guess it's too late now.
A year later, I'm still disgusted at the meaningless number slapped onto my username.
As if it's not bad enough that I'm called "Man".