Well, are they historically wealthy families or nouveau riche? I mean, Hollywood actors are obviously rich, but don't use names that reflect that... Many of my classmates in grad school were from historically rich families... so I'll tell you their real names, not the ones I associate with wealth... Keep in mind, they all Americans in their mid to late 20s...
Graham (and I know one Graeme)
Those are all I can think of... Oh, and a Geoffrey.