Kiernan is a distinctive boys' name in United States, ranking #1854 in 2001 with 60 recorded births. The name reached its all-time peak in 2008 with 77 births ranking #1888. Since 1996, the popularity has increased by 20.0%. In 2001, approximately 1 in every 32,381 boys born was named Kiernan. RISING Recent data shows the name is currently rising.