Eliza is probably on par with Elisa in other non-English speaking countries. Elzbieta is also popular, as of course Elizabeth in all its forms tends to be.
If the names are very popular, they are probably pretty widely distributed over all socio-economic and educational groups.
And English and American culture is more widely known than ever before thanks to the Internet, so a "typically English" name like Amanda wouldn't be so unusual.
Before you criticize a man, walk a mile in his shoes. That way, when you criticize him, you're a mile away and you have his shoes!
Steve Martin