Woo hoo! You just made my day.
Oddly enough, I thought you were female when I first saw your name. I think it reminds me of Clotho, one of the Fates.
Actually, now that I think about it, there’s a story by Hal Ellison called “The Cheese Stands Alone” in which the main character is confronted by Clotho in her cross-dimensional-rare-book store. He calls her “turtle-lady” frequently. Funny ol’ world, huh?
There’s a “Kun” in my real name somewhere.
Some friends have been teasing me about this, calling me “Ezar Kun”. Perhaps not teasing, since it is a honour to be nicknamed after one of the most badass Sith of all times 
But I feel unworthy to take on such a prized name. Hence “Extrakun” I humbly remained.
Movie: The Old Dark House, 1932, named for the 102-year-old patriarch. I was going to use the name of character played by the deliciously fem Ernst Thesiger, but I didn’t like the name Horace. So devotees of this film will get the irony that Roderick was actually played by a woman.
Nope
I don’t.
4a) Is your username gender neutral/confusing?
No, but see answer to #1.
4b) Has this ever caused you problems and/or entertainment?
Gee, not so far. Dern it.
**1)What’s the story behind the name you chose for yourself here? **
I first came here (when things were free) to bust my good friend, Moe’s chops. My first post was an exercise in stupidity and I didn’t think I would ever use the account again. At the time, I was listening to the “Tony Kornheiser Radio Show” which kept playing a sound bite of a caller mis-pronouncing the producer’s name (Which was/is Andy Pollin.)
**2) Do you use it everywhere? **
No. I originally used it thinking my Straight Dope persona would be short lived, After my first post, I didn’t post again for almost 14 months. So my name wasn’t attached to any of my other on-line names. A funny thing happened though, I found that I really liked this place and started coming more & more.
3) If not, what other interesting aliases do you use online?
My E-mail addresses & screen names over the years have been a variation of the word “Goliard” & my name. Currently, GoliardJay is my AIM and Email name, and just plain Goliard is my myspace name. I think the word Goliard is interesting (it refers to medivel wandering minstrels who sang satrical songs) but I’m probably among the few who do.
4a) Is your username gender neutral/confusing?
Nope. Although folks tend to think it’s my actual name.
4b) Has this ever caused you problems and/or entertainment?
It pleases me when a Doper also happens to be a Kornheiser fan and they hear the soundbite “AndyPolley!” in their head when reading my posts.
When trying to log in I got tired seeing that my chosen pseudonyms were all preoccupied. So I opened haphazardly Howard & Moore’s Complete checklist of the birds of the world, third edition 2003, and found the name at the top of the page 393. (That’s from my first thread [thread]Fickle continents[/thread] on request)
Do you use it everywhere?
No
If not, what other interesting aliases do you use online?
Another bird name: Apus (not really interesting)
4a) Is your username gender neutral/confusing?
Who knows ?
4b) Has this ever caused you problems and/or entertainment?
Not yet (don’t see how it could)
1) What’s the story behind the name you chose for yourself here?
Malacandra comes from Out Of The Silent Planet, by C S Lewis. It is the name of both the planet Mars and its ruling oyarsa, an archangel in everything but name, the supreme planetary authority under Maleledil.
2) Do you use it everywhere?
Nope, just one other website. Good luck finding it 
3) If not, what other interesting aliases do you use online?
I’ve been known online as “Socrates” and “Diogenes” in various venues. The latter wasn’t available when I registered here and I can’t remember what my second choice was, but no dice there either, so I picked the name from a favourite book and that was it.
4a) Is your username gender neutral/confusing?
Not if you’ve read your Lewis, but for those who haven’t, the “a” ending appears feminine to quite a few. Some people have associated the “Mal” part with “bad” or “evil”, for that matter.
4b) Has this ever caused you problems and/or entertainment?
The odd brief hiatus, but nothing that can’t be sorted out with a spot of droning on about how great C S Lewis was 
**1)What’s the story behind the name you chose for yourself here? **
I’d never had a user name before, so I really didn’t know what to call myself. I’m a theatrical lighting (and other stuff) guy who sometimes acts like a tool, so lightingtool seemed to fit.
**2) Do you use it everywhere? **
This is the only place I use it, but it’s also the only place I go, so I guess so. My other email addresses are all work related, so they are just some version of my real name.
3) If not, what other interesting aliases do you use online?
I got nothing.
4a) Is your username gender neutral/confusing?
I guess it could be, but it hasn’t been so far (I think).
4b) Has this ever caused you problems and/or entertainment?
The gender thing hasn’t, but a lot of people do think my name is lightningtool, which brings to mind (to me, anyway) a 15 year old pimply kid in his mom’s basement thinking he is a tool of some great god of lighting. That’s not really me.
1) What’s the story behind the name you chose for yourself here?
It’s a strange story, but in high school, I assigned myself and my friends aliases. Mostly we used them so that we could write notes for each other and leave them in the common areas to be picked up, and other people wouldn’t know who they were for or what they were about. The aliases were deliberately gender neutral–at least where first and middle initials only were used. This was, of course, before the advent of text messaging.
There was also a club aspect to it, and there was a supposed hierarchy amongst the members, but it was mostly just a joke.
Q.N. Jones (leader)
W.N. Smith (sidekick)
M.N. Black (first associate)
P.N. Green (2nd)
?.N. Brown (3rd)
?.N. Grey (4th)
?.N. Brown (5th)
C.N. Nelson (token male)
These days, we’d probably get reported as the second coming of the Trenchcoat Mafia. Anyway, I’ve used Q.N. Jones as an alias ever since then, especially when I want to be anonymous online.
2) Do you use it everywhere?
No. I use two different online aliases. I use something else in places where I don’t care if someone recognizes me. Because this place has a bit of a confessional element at times, I prefer to stay anonymous.
3) If not, what other interesting aliases do you use online?
The other is based on a childhood nickname.
4a) Is your username gender neutral/confusing?
Yes. Most people assume that anyone using a name with the configuration F.M. Lastname is a guy, and I’m not. I’ve thought about putting a Ms. in front of my user name, but that just looks stupid to me.
4b) Has this ever caused you problems and/or entertainment?
Minor irritation.
PapSett is the shorteneing of my 2 dog breeds , Pap illons and Gordon Sett ers
Mostly , except at the 2 RPG sites I call home
At Legolas’ Keep I am Lady Jena , and at the Captain’s Cabin , I am Khyla Kendall
4a) Is your username gender neutral/confusing?
Pretty much neutral
4b) Has this ever caused you problems and/or entertainment?
Heh … in a chat room once I was referred to as PapSMEAR…
Seems to me like that would be a problem and entertainment all at once.
1)What’s the story behind the name you chose for yourself here?
An older, less known song from my favourite band, Depeche Mode.
2) Do you use it everywhere?
Pretty much everytime I need to register somewhere.
3) If not, what other interesting aliases do you use online?
I first started out occasionally using my real name and Detox but I’ve pretty much stuck with Ice Machine for the past several years.
4a) Is your username gender neutral/confusing?
I’m pretty much a lurker but I haven’t come across any issues.
4b) Has this ever caused you problems and/or entertainment?
Nope
As an aside, Asimov is my favourite author.
1)What’s the story behind the name you chose for yourself here?
It is a play on my middle name, Maxwell. I tend to stay away from using Maxwell because of all the Maxwell House coffee jokes. Mad Max is almost always taken, but Madd Maxx usually isn’t. My first name is pretty unique and could get me recognized.
A few places, like PartyPoker.
I have an Yahoo! email address that is my first and last name with NO numbers! stupid newbs with all their 2345624 and what not.
4a) Is your username gender neutral/confusing?
Nope, cause I’m a dude.
4b) Has this ever caused you problems and/or entertainment?
Fortuntely/Unfortunately, no. To date no one has confused me with Mel Gibson, but here’s to hoping.
1)What’s the story behind the name you chose for yourself here?
Cookies. Lavenderlemon cookies. Yummy. I was making them while reading the SDMB.
2) Do you use it everywhere?
No.
3) If not, what other interesting aliases do you use online?
I invoke my fifth amendment rights.
4a) Is your username gender neutral/confusing?
Probably.
4b) Has this ever caused you problems and/or entertainment?
Nope