Killean is a distinctive boys' name in United States, ranking #8523 in 2017 with 9 recorded births. This places Killean in the bottom 40% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2017 with 9 births ranking #8523. In 2017, approximately 1 in every 205,591 boys born was named Killean. STABLE Recent data shows the name is currently stable.