I would think that famous names associated with large corporate empires would be enough.
http://www.nndb.com/lists/439/000127058/
Families are listed in ranked order (according to 1924 tax records) with their primary sources of wealth.
1 Rockefeller Family Standard Oil
2 Morgan Family J. P. Morgan & Co.
3 Ford Family Ford Motors
4 Harkness Family Standard Oil
5 Mellon Family Aluminum Company
6 Vanderbilt Family NY Central R&R
7 Whitney Family Standard Oil
8 Standard Oil Families Standard Oil
9 Du Pont Family DuPont
10 McCormick Family International Harvester, Chicago Times
11 Baker Family First National Bank
12 Fisher Family General Motors
13 Guggenheim Family American Smelting & Refining Co.
14 Field Family Marshall Field's
15 Curtis-Boks Family Curtis Publishing Co.
16 Duke Family American Tobacco Company
17 Berwind Family Berwind-White Coal Co.
18 Lehman Family Lehman Brothers
19 Widener Family American Tobacco Company, public utilities
20 Reynolds Family R. J. Reynolds
21 Astor Family Real estate
22 Winthrop Family Miscellaneous
23 Stillman Family Citibank
24 Timken Family Timken
25 Pitcairn Family Pittsburgh Plate Glass Co. (now PPG Industries)
26 Warburg Family Kuhn, Loeb & Co.
27 Metcalf Family Rhode Island textile mills
28 Clark Family Singer Sewing Machine Co.
29 Phipps Family Carnegie Steel
30 Kahn Family Kuhn, Loeb & Co.
31 Green Family Stocks and real estate
32 Patterson Family Chicago Tribune
33 Taft Family Real estate
34 Deering Family International Harvester
35 De Forest Family Corporate law practice
36 Gould Family Railroads
37 Hills Family Railroads
38 Drexel Family J. P. Morgan & Co.
39 Ryan Family Stock market
40 Foster Family Auto parts
41 Johnson Family Victor Phonograph
42 James Family Copper and railroads
43 Nash Family Automobiles
44 Schiff Family Kuhn, Loeb & Co.
45 Patten Family Wheat market
46 Hayden Family Stock market
47 Weber Family Allied Chemical & Dye Corp.
48 Blumenthal Family Lazard
49 Mills Family Mining
50 Friedsam Family Merchandising
51 McLean Family Mining
52 Higgins Family New York real estate
53 Cochran Family Textiles
54 Kirkwood Family
55 Tyson Family
56 Huntington Family Railroads
57 Storrow Family Lee Higginson & Co.
58 Rosenwald Family Sears Roebuck
59 Baruch Family Stock market
60 Kresge Family Merchandising