Killian is a moderately popular boys' name in United States, ranking #347 in 2021 with 939 recorded births. The name reached its all-time peak in 2017 with 1,505 births ranking #248. Since 1996, the popularity has increased by 547.6%. In 2021, approximately 1 in every 1,862 boys born was named Killian. STABLE Recent data shows the name is currently stable.