Kiernan is a distinctive girls' name in United States, ranking #14367 in 2024 with 6 recorded births. The name reached its all-time peak in 2002 with 34 births ranking #3851. Since 1996, the popularity has decreased by 72.7%. In 2024, approximately 1 in every 268,865 girls born was named Kiernan. FALLING Recent data shows the name is currently falling.