Kiernan is a distinctive boys' name in United States, ranking #2833 in 2014 with 42 recorded births. The name reached its all-time peak in 2008 with 77 births ranking #1888. Since 1996, the popularity has decreased by 16.0%. In 2014, approximately 1 in every 45,725 boys born was named Kiernan. RISING Recent data shows the name is currently rising.