Everyone is born with a true name that they intuitively know but can't say, and they also have a unique soul-color. And there are special glow-stones that you can think your true-name at, which will then glow the same as the soul-color of the person with that name.
I'd rather not solve the problem by adding magic that doesn't fit into the existing system. Especially suspiciously convenient magic.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.