The clumsy art of trying to name a book

I'm halfway through writing a book. It doesn't have a title. One day I'll finish writing the book. It still won't have a title. The problem is I think of something brilliant, and then the next day realise that it's rubbish. The title is meant to be obvious as soon as I hear it. It's probably right under my nose. And where do I get these titles from? Random words I pull out of thin air that I think might describe the book, or just sound vaguely cool. Do I go for a neat one-word title or one that's slightly too long? There's so many options, and none of them are any good. Here's some of the ones I threw away.

The Last Children of the Mountains

Too pretentious.

The Boy in the Broken Mountains

It was pointed out to me that this sounds like 'Brokeback Mountain', and my book is not about becoming old or gay.

Nowhere

I like this, but it might be too vague, even for me.

It's Very Quiet in the Mountains

I thought this sounded really ominous at the time, but I've since realised it's not. 'Yes, it is quiet in the mountains, what's your point?'

If I think of one, and I might, then it had better be good. Once something's in print it's... there, in print. I'm trying not to think about it. The next chapter is more fun.