So. He should focus on the things that are not unnecessary, like figuring out how to prevent his father from accidentally or deliberately revealing his name to Promise.
It seems like the only viable means of preventing it is to ask Promise to use orders. Of course, the real danger of Promise learning his name is that she might try to use him for something, and if she has plans in that direction then asking her nicely not to learn his name won't actually help anything. But she seems both too ethical and too practical to try something like that, and Ruava evidently agrees. And he is not so carefree lately that he can afford an extra source of stress.
"If I give you my father's name, can you prevent him from telling you mine? Will you?"