The name tells me it has been created when you were a child. Not that you are a child right now.
As others already pointed out, names often get created at young age, and stick with you.
Pretty much this, I wish I could get a new name for here, but I do still like it a bit, minus the "xXx" . Also it is not in reference to the cliche Grim Reaper it is http://en.wikipedia.org/wiki/The_Grim_Adventures_of_Billy_%26_Mandy one of my favorite childhood cartoons, the connection to the urban legend grim reaper never dawned on me till after I had created it :sadvaultboy:
.. I should probably put my avatar back up to clarify this
Hopefully it worked.
EDIT: Also, sorry, forgot , but if someone doesn't download one of your mods because of your forum name, that is a pretty shallow move. Just post lots of nice pictures, and a amazing description of it, and I think those select few who download based on a forum name will be pleasantly surprised and rethink their decision