Killian

Meaning & origin

Killian entered the U.S. baby name charts in 1915, but its growth remained modest through the 20th century. A notable surge began in the 1990s, and by 2017 it reached its peak rank of 339. Since then, the name has declined, falling to rank 417 in 2025, with approximately 1 in 2,218 newborn boys receiving the name. Its popularity is strongest in Vermont, South Dakota, and West Virginia, suggesting a regional appeal. Irish heritage names have fueled Kilian's rise, though it remains less common than fellow Irish revival names like Liam and Declan. The name's trajectory shows a steady increase followed by a gradual decline, typical of names that peaked in the 2010s. While no longer at its high point, Killian still enjoys solid usage and recognition.

Killian is the Anglicized form of the Irish name Cillian, derived from 'ceall' meaning 'church' or possibly 'strife' or 'bright-headed'. The name was popularized by Saint Kilian, an Irish missionary who evangelized in Franconia in the 7th century. It has seen a resurgence in modern times, particularly in the United States, where it has become a popular alternative to similar-sounding names.