There are an estimated 373 people named Hennessey alive worldwide today. That ranks Hennessey at #19340 globally, with the highest concentrations in United States.
In the United States, Hennessey is held by approximately 373 people, ranking #19340 among first names. That works out to roughly 0 per 100,000 Americans (or 1 in 889,812 U.S. residents).
Historically Hennessey is used overwhelmingly as a female name (100.0% female).
Hennessey appears in birth records going back to 1880. Use the chart below to see how its popularity has changed across decades, and the surname section to find common pairings.