Arlan- my dad has a cousin named
Harland, with is similar. It's also like his cousin Arla and aunt Arlia (pronounced the same)
Jaidon and Kadin- there are several spellings for the 'aidens', so these make sense as American names to me.
Montana- the only one I know is a girl.
I agree that the reason that they're 'typically "American"' is that you would be more likely to meet one here instead of Britain, Canada, Australia, or any other English speaking country.