I think it'd just be more helpful to carve the person's name in their own forehead.

That way, each person's name only needs to be carved once (as opposed to, say, you, me, Billy, and Sally all having Hank's name carved into out bodies).

Also, if you carve the name of every person that you have trouble remembering, then eventually you just have a list of names. And what good will that do? Afterall, the only difference between a list of names on your body and not, is that it lessens the choices you have when you meet a familiar face whose name you can't remember.