This is a really confusing feat.
What exactly do you mean by naming someone? Is it simply choosing an ally? If so why is it not "you are able to add +2 to the will saves of three allies of your choise who can hear you speaking"? Or does a member of the Athar have to convert the person so bolstered over to the Athar after their faith is shaken to give them the boost? Or is it simply a matter of helping to comfort someone after losing their faith. Then again after someone has had their faith shaken would they really want to see a member of the Athar? They might react in the oposit direction beliving that their faith is instead being tested and decide to kill the infidel.
You know, it's a funny thing about conversion: you can never be sure that someone's going to believe in your cause.