Hennessy is a distinctive girls' name in United States, ranking #2640 in 2022 with 66 recorded births. The name reached its all-time peak in 2019 with 82 births ranking #2239. Since 1996, the popularity has increased by 407.7%. In 2022, approximately 1 in every 24,830 girls born was named Hennessy. STABLE Recent data shows the name is currently stable.