Kiernan is a distinctive girls' name in United States, ranking #8726 in 2023 with 12 recorded births. The name reached its all-time peak in 2002 with 34 births ranking #3851. Since 1996, the popularity has decreased by 45.5%. In 2023, approximately 1 in every 133,554 girls born was named Kiernan. FALLING Recent data shows the name is currently falling.