User blog comment:SlappyWiggins/What's the story behind your screen name/@comment-3985892-20110725181129

SlappyWiggins:

The story behind my username....hmm....... Well the name " Kally " is a combined version of my name and my sister's name, we both use this user. My name is Katherine, and her name is Ally.

So it's like this: (Ka/therine) + (A/lly) = Kally

The " 001 " part, we got it from an anime! XD