Killian

Boy name

Killian has been given to 16,834 babies in the U.S. since 1915. It peaked in 2017 and currently ranks #418 for boys (2025).

Meaning & origin

An anglicized spelling of Irish Cillian.

Origin: Irish

Etymology adapted from Wiktionary, licensed CC BY-SA 4.0.

Hover or tap the chart to read any year.

Total babies

16,834

Peak year

2017 (1,528 babies)

Rank in 2025

#418 for boys

First recorded

1915

10-year trend

▼ -22%

Gender split

4% girls / 96% boys

Same primary gender, peaked around the same years, and roughly as common as Killian.

17,169 babies since 1982

17,193 babies since 1964

17,282 babies since 1929

16,225 babies since 1922

17,649 babies since 1916

17,971 babies since 1973

15,681 babies since 1987

18,178 babies since 1893

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