Back on the first day of moderation, which was three years ago next week, me and the other original moderator (
"Moderator1" a.k.a.
"Burkey") decided to be anonymous. Randy assigned sequential handles, at our request.
About three weeks later we decided to end anonymous moderation, after a ground-swell effort of posters to "out" us

. We decided to maintain the handle, as a way of people immediately knowing we were acting as a moderator. We added a signature line with our normal name, so posters knew who was behind the posting.
Soon after Burkey and I started moderating, a third moderator was named, but she decided to use her normal handle. I recall there were some instances where people weren't sure whether she was posting as a regular user or moderator, as the old software at that time did not have any sort of flag, Consequently I believe she would add a signature line to designate "official" moderation acts.
There was a pretty long period before other moderators were added, maybe six months. No one else apparently ever asked for a sequentially assigned name. Eventually the de facto practice was to use one's normal handle.
I have to log in and out, to change my handle. A bit of a pain I'll admit, but one wouldn't want to kill off a legacy tradition

.