rare divination 

Traditions arcane, divine, occult, primal

Cast [R] somatic; Trigger A creature on your plane speaks your private or true name; Requirements You know your own true name.

Saving Throw Will

You learn a private name (but not the true name) of the creature who spoke your name, as well as their precise location, unless they succeed at a Will save to negate the effect. You are aware any time the trigger conditions are met as long as you have the spell prepared or in your repertoire. There is no way to distinguish one trigger of this spell from another without actually casting the spell.

This can become a nuisance if you are so famous that your name is regularly on others' lips.

Secrets of Magic, page 247.