Well, Dev is my name, and 0115, well all my other names end with that, I guess I try to keep them all the same, so its easy to remember. It all started w/aim, and they wouldnt give me any other numbers, so therfor I go by the name Dev0115
My username comes from my real name: Luis, but I just changed the last letter to z so it would look "cooler" . No really, it's been long since I did that and all my usernames are the same.
The number is meaningless, I just like the way it looks.