How Common Is the Surname Hennessey?
The surname Hennessey is the #4,245 most common last name in the United States, with an estimated 9,506 bearers. That's about 1 in 35,335 Americans. This data comes from the 2010 U.S. Census Bureau surname frequency tables.
This page covers the Hennessey surname's frequency in the U.S. population, its rank among all American surnames, and a breakdown of ancestry and ethnicity data from the Census. You can also check how many people share any first + last name combination involving Hennessey.
Estimated Americans with this Surname
9,506
About 1 in 35,335 people in the U.S.
Census Rank
#4,245
Frequency Rate
2.83
per 100,000 people
Census Count
8,357
2010 Census
Data Source
2010
U.S. Census Bureau
Ancestry and Ethnicity for Hennessey
The Hennessey surname is most commonly associated with people who identify as White (94.69%). The next largest groups are Hispanic (2.38%) and Two or More Races (1.28%).
Self-reported race and ethnicity from the 2010 U.S. Census Bureau surname tables. Some categories may be suppressed for privacy when sample sizes are small.
How Many People Are Named ... Hennessey?
Pair the Hennessey surname with a first name to estimate how many people share that full name in the United States.
Hennessey Surname: Questions and Answers
How common is the last name Hennessey?
Hennessey is the #4,245 most common surname in the United States, with an estimated 9,506 people sharing this last name. It appears at a rate of 2.83 per 100,000 Americans.
What ethnicity is the surname Hennessey?
The Hennessey surname is most commonly associated with people who identify as White (94.69%). The next largest groups are Hispanic (2.38%) and Two or More Races (1.28%). This data comes from the 2010 U.S. Census Bureau surname tables, which include self-reported race and ethnicity breakdowns.
How many people named [First Name] Hennessey are there?
We can estimate any first + last name combination. Popular examples: Michael Hennessey, James Hennessey, John Hennessey. Search any combination on our homepage.
Where does this surname data come from?
Surname frequency data comes from the 2010 U.S. Census Bureau decennial surname tables. These list every surname appearing in the Census along with frequency rates and demographic breakdowns. Full methodology.
Search for a full name combination
How Many of Me