Whargarble posted...
Being literally always successful at guessing names is not minor. That's marketable. I'd love to use that to spook the shit out of people or take bets from strangers as a street performer that I can guess their name.
More than that, it would let you take one look at security camera footage or photos and identify people committing crimes, or immediately identify anyone using a fake name for whatever reason. The security and counter-espionage potential is pretty massive.