In the usual sense used in the US, they’d mostly be above the upper middle class and into the upper class.
In the more theoretically grounded system otherwise used when discussing capitalist societies, they’d still all be, at birth, be at least petit bourgeois, so the idea that such names are clear indication of membership in the “lower classes” is only even possibly true of capitalist classes in the narrowest possible sense (“not of the haut bourgeoisie”, though even that is a stretch), or maybe if you are speaking of vestigial pre-capitalist class systems, and still just as narrowly (“not the titled nobility”).
