I changed mine. I was about to start publishing in my profession, so it was an opportune moment. And before I changed it, if you googled myfirstname hislastname in quotation marks, there were absolutely no hits. So in changing my name I became the only me on the internet. Which I thought was pretty cool. I have an unusual enough first name that I never really had the last name attached, so it isn't too much of an identity issue for me. The new last name has a heck of a lot of letters though...