Most common Names and Surnames (in USA)

Data based on the 1990 census.

Surnames

Ranking	Surname	#People
1	Smith	2,772,200
2	Johnson	2,232,100
3	Williams	1,926,200
4	Jones	1,711,200
5	Brown	1,711,200
6	Davis	1,322,700
7	Miller	1,168,400
8	Wilson	934,200
9	Moore	859,800
10	Taylor	857,000
11	Anderson	857,000
12	Thomas	857,000
13	Jackson	854,200
14	White	768,800
15	Harris	757,800
16	Martin	752,300
17	Thompson	741,300
18	Garcia	699,900
19	Martinez	644,800
20	Robinson	642,100
21	Clark	636,500
22	Rodriguez	631,000
23	Lewis	622,800
24	Lee	606,200
25	Walker	603,500
26	Hall	551,100
27	Allen	548,400
28	Young	531,800
29	Hernandez	529,100
30	King	523,600
31	Wright	520,800
32	Lopez	515,300
33	Hill	515,300
34	Scott	509,800
35	Green	504,300
36	Adams	479,500
37	Baker	471,200
38	Gonzalez	457,400
39	Nelson	446,400
40	Carter	446,400
41	Mitchell	440,900
42	Perez	427,100
43	Roberts	421,600
44	Turner	418,900
45	Phillips	410,600
46	Campbell	410,600
47	Parker	402,300
48	Evans	388,500
49	Edwards	377,500
50	Collins	369,300
51	Stewart	366,500
52	Sanchez	358,200
53	Morris	344,500
54	Rogers	338,900
55	Reed	336,200
56	Cook	330,700
57	Morgan	325,200
58	Bell	322,400
59	Murphy	322,400
60	Bailey	316,900
61	Rivera	311,400
62	Cooper	311,400
63	Richardson	308,600
64	Cox	303,100
65	Howard	303,100
66	Ward	297,600
67	Torres	297,600
68	Peterson	294,900
69	Gray	292,100
70	Ramirez	289,300
71	James	289,300
72	Watson	283,800
73	Brooks	283,800
74	Kelly	281,100
75	Sanders	275,600
76	Price	272,800
77	Bennett	272,800
78	Wood	270,100
79	Barnes	267,300
80	Ross	264,500
81	Henderson	261,800
82	Coleman	261,800
83	Jenkins	261,800
84	Perry	259,000
85	Powell	256,300
86	Long	253,500
87	Patterson	253,500
88	Hughes	253,500
89	Flores	253,500
90	Washington	253,500
91	Butler	250,800
92	Simmons	250,800
93	Foster	250,800
94	Gonzales	239,700
95	Bryant	239,700
96	Alexander	234,200
97	Russell	234,200
98	Griffin	231,500
99	Diaz	231,500
100	Hayes	228,700

Female Names

Ranking	Name
1	Mary
2	Patricia
3	Linda
4	Barbara
5	Elizabeth
6	Jennifer
7	Maria
8	Susan
9	Margaret
10	Dorothy

Male Names

Ranking	Name
1	James
2	John
3	Robert
4	Michael
5	William
6	David
7	Richard
8	Charles
9	Joseph
10	Thomas

The article in Wikipedia about surnames is a really interesting reading!.