I bet you never knew that one reliable resource of dictionary based password attacks is the US Census bureau. 

http://www.census.gov/genealogy/names/names_files.html

For example, below are 3 lists of the most common names registered in US :

First ten last names entries
name	freq	cum.freq	rank
SMITH	1.006	1.006	1
JOHNSON	0.810	1.816	2
WILLIAMS	0.699	2.515	3
JONES	0.621	3.136	4
BROWN	0.621	3.757	5
DAVIS	0.480	4.237	6
MILLER	0.424	4.660	7
WILSON	0.339	5.000	8
MOORE	0.312	5.312	9
TAYLOR	0.311	5.623	10
First ten female entries
name	freq	cum.freq	rank
MARY	2.629	2.629	1
PATRICIA	1.073	3.702	2
LINDA	1.035	4.736	3
BARBARA	0.980	5.716	4
ELIZABETH	0.937	6.653	5
JENNIFER	0.932	7.586	6
MARIA	0.828	8.414	7
SUSAN	0.794	9.209	8
MARGARET	0.768	9.976	9
DOROTHY	0.727	10.703	10
First ten Male entries
name	freq	cum.freq	rank
JAMES	3.318	3.318	1
JOHN	3.271	6.589	2
ROBERT	3.143	9.732	3
MICHAEL	2.629	12.361	4
WILLIAM	2.451	14.812	5
DAVID	2.363	17.176	6
RICHARD	1.703	18.878	7
CHARLES	1.523	20.401	8
JOSEPH	1.404	21.805	9
THOMAS	1.380	23.185	10

so, how high is your name on the list ?

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