To me American names are names that are hardly used in
Europe and if so not on the same gender. They don't need to be American in origin, though. So to me
Karen wouldn't be one of them. Nancy...hmmm not sure.
I'd say:
Lindsey,
Lindsay,
Kelly,
Jody,
Jamie,
Tracy,
Stacy,
Robin.
I'm
German and -ey names on girls always sounded very American to me. For this generation or the 90s I'd say
Kelsey,
Ashley,
Ainsley, Ashby,
Courtney,
Kaylee and
Hayley sound very American.
Or because she was born in the 60s/70s maybe something like
Dawn or
Misty.