Well, my original username for this game, LizTheLycan from 2013, was just my name, combined with lycan, because edgy werewolf phase.
Then I came up with TwistedLizard, a name I still use for most things (too lazy to change), because again, edgy, matched my sick, sick sense of humor, and hey, lizards are cool and sound like my name.
Scuttlefeet was originally a joke from League of Legends, because I would always be tryin' t'kill the Scuttlecrab while everyone else was goin' for dragons, so I made it my username there, and it became what I was known as from that point on. Later I changed my main character to Scuttle, and it sticked. The name is taken sometimes though, and I'll use Scuttlepaws or Scuttlebutt.