I'm sure the Mods or the Admins could change your display name, but as soon as they do it for one person.... they'll end up changing peoples display name every 5 mins.
Doesn't mean they won't do it, but it was just a thought.
*EDIT*
If they do say no, just change you tag (text under your display name) to 'A.K.A Jacques' or something like that.
www.stevenegan-cgi.com
"Your weapons are no match for ours! People of Mars, surrender!"
"Um, this isn't Mars. This is Earth."
"Earth? Earth-with-nuclear-weapons Earth?"
"Yes."
[long pause] "Friend!!"