LOL, I actually have TWO named Vanguard. (I had forgotten about the first one.) And recently some suggested a hero named Armadillo ... and I have a villain named that.
If you are familiar with Champion rpg from the 80's or GURPS Supers rpg, I did use many of the character concepts and names from those systems. Of course many are complete rewrites ... or people who took up he name (like their kids or someone who idolized them).
And yes, heroes. Although you COULD be a villain suddenly turned hero after some of the new villains gave you a fresh perspective, but you need to be very careful about that. You need to be something the Law might consider for redemption (ie no murderers or terrorists).