I'm looking back at how I remember Duke Nukem from Captain Planet back in the 90s, didn't know about the 3D Realms character till 2002. Eventually, joined the 3DR forums in 2004. Changed the display name one day in 2005, without checking first, it got approved soon after. Since then, I've used the name on a lot of sites, online networks, and so on.
Not bad for a name that's been in use for 10 years.