Well I have a decent story for my original username, toughenough6.
I made this one for my youtube channel, and it is pretty self explanatory.
I have had toughenough6 as most of my usernames since around 6 or 7 years ago. It all started when I was playing Runescape, I had been playing for a while, but then I stopped.
About a month later, I found an ad for Runescape saying "Are you tough enough?" So I thought to make a new account, to prove I was XD. "Toughenough" was taken though, and the name suggester suggested toughenough6. I still have access to this runescape account today, and many of my other names including my original youtube name, my skype, my minecraft name, and more are all toughenough6.