Didn't know people in the US saw them as 'archaic' and 'uppity' though I guess it's the same as us here thinking Randy* and Hunter are ridiculous.
The MC in my current WiP is called Alistair. My main audience will be people from the US, so if anybody from the US wants to assure me you don't think it's a crappy name, that'd be much appreciated! I used to date a guy called Alistair and he had one of the strongest Devon** accents I've ever heard, so the whole idea that it's 'uppity' is hilarious.
A character in one of my other WiPs is called Sebastian, but goes by Seb.
I wouldn't say Gabriel was 'very rare.' I used to know someone called Gabe.
Auster... is that even a name?! Never heard that in my life. Milton's a horse. Everett sounds American. Or makes me think of baby hares. And Lionel Ritchie.
What sort of name are you after? Do you want an archaic name? Cos I'd go for something like Atticus.
* one of our customers where I work (my customers are from North America) is called Randy Hamburger. Which I think is my favourite name of anybody in the whole universe.
**which is in the south west. So it's not just confined to the north or Scotland either.