I was thinking about forum names and thought I would start this thread. It’s a pretty common one on other forums.
Mine is obviously boring (just my first initial and last name).
There are lots of way more interesting ones here in this forum.
Tell us what significance yours has and how you came to pick it
Mine is also boring…
It was going to be Natebrew, but that was apparently taken on the forum I first tried to make it on (the BN or homebrewtalk). So, I added an ‘s’ to make it more of a verb than a noun.
I drink beer and whiskey and like to smoke cigars! Those are my “major vices”!
Mine is a play on Hail State which is a common phrase at Mississippi State University where I used to work. I added y’all because that’s what we say in the South. I thought about changing it since I no longer work MSU don’t live in Mississippi anymore but I haven’t. I have fond memories.
If you add an “e” to the abbreviation of AL it will still work. 
Alewife was a woman who kept an alehouse historically. An Alewife is also a small fish. Being a female brewer kind of makes me a small fish in a big pond of mostly guy brewers and I keep my own alehouse for my Brit husband and friends…so, it was a no brainer. I added the “Y” to make it my own and give it the olde English spelling.
I’m an Indiana University grad and a lifelong IU basketball fan (team name being the Hoosiers) , so it was a no brainer for me.
Well, my name’s Frank, and I brew on a cobbled together system of equipment that I collected on the cheap.
It’s my name…
Erock is a nickname I picked up from a bandmate in college, and R.Ph. is the abbreviation for Registered Pharmacist (my profession). It has become my standard handle on internet forums over the years.
my last name and the first letters in my first name.
easy since it was a log-in name at one university where I used to work
I played in a band called “Surrounded by Jeds” in the early nineties. People shortened it to “The Jeds” and the three of us went by the names of Danny Jed, Tommy Jed, and Johnny Jed.
I like it. Ramones style. 
I home brew in 'Bama. (boring)
J.R.R Tolkien fans will recognize my name as the innkeeper of the Prancing Pony.
I threw cases for 18 years as an order selector and then loader at a food service warehouse. The last 10 years I was produce QA on my shift but by then I was using casethrower as a log-in name for various websites.
Mainebrewer - I live in Maine and I brew.
Not terribly creative!
My moniker goes all the way back to the early Compuserve days. I needed an identity for playing bridge on-line and my main hobby back then was gardening. So I became _O_rganic _G_ardener IN ME (Maine).
Several years later, we moved to a small farm and started raising dairy goats, so it was switched to Odd _G_oat. Now, many years later, I modified it to _O_ld _G_oat and even though I moved down to the far south (New Hampshire) it had been used in so many forums, that I didn’t dare change it.
The first email address I ever had in 1993 started with my first and middle initials. I’ve been using this as a username everywhere ever since. Plus, can you imagine how many Dave Taylors there are on this planet?! The middle initial helps a little bit, but there are also way too many David M. Taylors. Oh well. I’m the one who’s addicted to homebrewing forums.
I came by mine a long time ago when others (on another forum)started to refer to me as “braufessor” because I brewed beer and was also a teacher. Just kind of stuck and I kept using it on other forums.