I voted Asher - I have only known one boy of that name in elementary school. He went by Asher, too, not Ash. Though I have an Indian friend named Ashraf and he goes by Ash. Anyways, I have never heard of the other two names. Rainer is similar to Rainier, like Mt. Rainier (though I've never seen it as a name), or just Rainn, like Rainn Wilson (Dwight from The Office). But, I've never heard of anything like Bridger before. Maybe that one would be too uncommon. Good luck to you - whichever you pick, I'm sure will be the right one for your future baby, and it sounds like you have lots of time to decide. :-)
I like Rainer, it sounds nice and unusual but not too unusual!
I voted Asher because in this book series I love one of the characters names is Acheron (pronounced Asheron) and I just love it. I'm not really fond of Bridger.
I voted Asher. :) I've always liked the name, but any boys we have will all start with "J" so I will never get to use it as a first name. =P
I figure Asher will get the most votes because people are more familiar with more common names beginning with "Ash."
We like the other two names for the reason that there isn't a lot of familiarity associated with them--but that isn't necessarily a good thing.
I dont really like bridger, doesnt click with me, asher is the best of the 3.