Killian is a moderately popular boys' name in United States, ranking #364 in 2022 with 902 recorded births. The name reached its all-time peak in 2017 with 1,505 births ranking #248. Since 1996, the popularity has increased by 522.1%. In 2022, approximately 1 in every 1,934 boys born was named Killian. STABLE Recent data shows the name is currently stable.