When it comes to the forum, "SheepInTheCity" comes from my Minecraft username at the time, which is inspired by the tune "Night In The City" by Electric Light Orchestra. I just replaced the word "Night" with "Sheep" (my favorite in-game animal) and voila... we have my name. This account used to be called KlockKid12Jr. That came about because I lost the password to my first account (KlockKid12) and couldn't be bothered to go through the whole "forgot-your-password" thing; instead I opted for creating a new account entirely.
As for Minecraft, I've had quite a few. Please read the spoiler down below:
KlockKid12: My very first username that I used when I bought the game on August 16, 2013. I used to be obsessed with clocks during this time, and I had just turned 12 (Aug 16 is my birthday) so me and my mom came up with this name.
Wizmilo: Back in the dark ages of 2014 (I was weird), I used to frequent a chatroom called Pokemon Showdown, on a (now defunct) server called "Frost". My username (one of dozens) was Wizeardreaux (Pronounced "Wizard Roe"; not sure where the wild E in "Wizeard" came from). Also, a cat who was very close to me (he was my bud since I was a baby) had just passed away from a bad case of laryngitis. His name was Milo. I can't remember what led him to do this, but a "friend" of mine (he was really my sister's friend) came up with the name "Wizmilo". And it stuck. When the ability to change names rolled around, this was the name I chose.
SheepInTheCity: I shouldn't have to explain how I came up with this.
RockyRacco: I ended up using this name three times. I wanted a name that had something to do with the song "Rocky Raccoon" by the Beatles. But knowing that "RockyRaccoon" was already taken (combined with a desire to avoid having numbers in my name) I came up with "RockyRacco." It's one of my favorite names, behind "SheepInTheCity".
MovingMan: I really don't like this one. I wanted a name that was inspiring somehow. I was inspired by the songs "Babaji" by Supertramp and "Bangladesh" by George Harrison. I don't remember how I came up with this name.
CitySheep: This, unfortunately, was a half-arsed name that I came up with on a whim.
I used RockyRacco again here....
RudyC4t: Have you ever heard of the Nintendo game "Animal Crossing"? Well, I named myself after a character in this game who's called... you guessed it, Rudy. He is a cat. (I was also partially inspired by the song "Rudy" by Supertramp)
Used SheepInTheCity again.
LeSkvid: Wanted a name that that had something to do with squids, since there was this cute squid skin I wanted to use. Put "The Squid" through French and a Russian accent, and you will get this name.
I used RockyRacco AGAIN. It also happens to be my current name as of the time of writing.