Hennessey is a distinctive girls' name in United States, ranking #16129 in 2024 with 5 recorded births. The name reached its all-time peak in 2015 with 27 births ranking #5037. Since 1996, the popularity has decreased by 16.7%. In 2024, approximately 1 in every 322,638 girls born was named Hennessey. FALLING Recent data shows the name is currently falling.