Kiernan is a distinctive boys' name in United States, ranking #3764 in 2019 with 29 recorded births. The name reached its all-time peak in 2008 with 77 births ranking #1888. Since 1996, the popularity has decreased by 42.0%. In 2019, approximately 1 in every 61,840 boys born was named Kiernan. RISING Recent data shows the name is currently rising.