My name is not available so I decided add some number. So that's why I picked it as my blog's name.
Is that number related to anything (for example your age, your lucky number), or just/only a randomly chosen one?
I am just/only curious.
By the way, I use this username (with a capital "X") on the internet since I have internet at home, which is approximately 2005. I do not remember exactly.
About my username:
When I first saw Dr. Dre - Xxplosive, I immediately thought that it would make a good username with one "X", that is how I created "Xplosive".