Is it possible that it's more of a psychological thing? Even if a non-Muslim by the name of George regard his name to have an effect on him, it'll actually have one. And on the other side if brother Muhammad doesn't regard his name to have an effect, then it will not have any either. I mean effect in terms of impact on ones way of life and thinking, of course not in terms of virtue or reward. (Just so noone thinks I'm trying to disrespect the name of Rasulullah .)