Hennessy has been given to about 1,630 people in the United States since 1880. It was most common in 2019, which makes it a current name.
Its best year was 2019, when 82 babies were given the name, ranking 2239th. The typical living American called Hennessy is about 15 years old today. It is relatively most common in California, where it accounts for 0.00% of births.
Source: US Social Security Administration, national and state name files, 2025 release, and the Office for National Statistics for England and Wales. Etymology researched and written by our editors. Living-population and median-age figures are our own estimates, described in the methodology.