Kiernan is a distinctive boys' name in United States, ranking #1920 in 2010 with 74 recorded births. The name reached its all-time peak in 2008 with 77 births ranking #1888. Since 1996, the popularity has increased by 48.0%. In 2010, approximately 1 in every 25,924 boys born was named Kiernan. RISING Recent data shows the name is currently rising.