Killian
- Pronunciation
- [Ki-lli-an]
- Gender
- Male
- Meaning
- Strife Or Battle Small: Fierce.
- Origin
- Irish
About the Name Killian
Killian descends from the Old Gaelic Cillín, possibly from ceall (church, monastic cell), or from cille (battle, strife) — yielding either "little church" or "little battle." The name has been used continuously in Irish naming traditions for over a millennium, anchored by Saint Kilian (c. 640–689 CE), the Irish missionary bishop who, with his companions Colmán and Totnan, was martyred in Würzburg, Germany.
Notable bearers include American actor Killian Jones (the fictional Captain Hook of ABC's Once Upon a Time 2011–2018); contemporary Spanish-French ultra-marathon runner Kilian Jornet (born 1987, multiple-time winner of the Skyrunner World Series); and the surname-bearer Irish poet Brendan Kennelly's contemporary Irish writers.
Killian's American climb is recent: the name climbed from outside the US top 1000 in 2000 to the US top 300 boys' rank by 2014 and the top 300 since. The name has been driven primarily by Irish-American naming and the broader American taste for distinctive Irish boys' names alongside Liam, Aiden, and Declan. The name's appeal sits in three contemporary American naming preferences: the Irish-Gaelic-saint pedigree, the in-built religious-historical sophistication, and the popular three-syllable structure with the distinctive K-K consonant rhythm. Three flowing syllables, soft consonants, and tonal versatility across casual and formal registers. Common nicknames Kil (the dominant short form), Kili, and the rare Lin each carry distinct registers; the alternate spellings Killian, Cillian (the Irish original spelling, used by actor Cillian Murphy), Kilian (German/Spanish), and Killion have their own SSA tracking. International forms include Cillian (Irish original), Kilian (German), Cilián (Latin), and the original Old Gaelic Cillín.
Source: U.S. Social Security Administration name data, 1880–2024 (methodology). By Marvin Tang.
Quick Facts About Killian
US Popularity History (2007–2025)
Annual US births named Killian by gender, from US Social Security Administration records. Peak year: 2017 with 1,505 boys named Killian (boy rank #248 that year).
Where it stands today: in 2025, ranked #418 for boys (770 US births). That's 170 places below its 2017 peak.
Source: US Social Security Administration. Limitations: US birth-certificate data only; names appearing fewer than 5 times in a given year are suppressed for privacy; spelling variants are counted separately. For names that ranked outside the US top 100 before year 2000, only the years they reached the top 100 are shown — the chart may have gaps for less-popular historical names.
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Where in the US Is Killian Most Popular?
Average boy-name rank within each state across 2016–2025 SSA records. A lower number means the name appears closer to the top of that state's boys-name rankings — a per-capita measure that isn't biased toward large states. For Killian the strongest states are Wyoming, Vermont, Montana.
Strongest boys-name states
| # | State | Avg rank | Births |
|---|---|---|---|
| 1 | Wyoming | #103 | 23 |
| 2 | Vermont | #106 | 20 |
| 3 | Montana | #150 | 54 |
| 4 | Alaska | #160 | 49 |
| 5 | New Hampshire | #173 | 56 |
| 6 | West Virginia | #204 | 101 |
| 7 | North Dakota | #213 | 40 |
| 8 | Maine | #220 | 18 |
| 9 | Hawaii | #228 | 26 |
| 10 | South Dakota | #255 | 27 |
Weakest boys-name states
| # | State | Avg rank | Births |
|---|---|---|---|
| 1 | Louisiana | #491 | 103 |
| 2 | California | #470 | 685 |
| 3 | New Jersey | #455 | 155 |
| 4 | Texas | #453 | 674 |
| 5 | Alabama | #433 | 112 |
| 6 | Minnesota | #431 | 137 |
| 7 | Georgia | #410 | 257 |
| 8 | Arkansas | #407 | 87 |
| 9 | Mississippi | #400 | 50 |
| 10 | Iowa | #394 | 99 |
Source: SSA state-level baby-name dataset 2016–2025. States with fewer than 3 years of data for Killian in this window are excluded. Births < 5 in a given state-year are suppressed by SSA for privacy.
Variant Forms
Looking for names like Killian?
A dedicated page with 60+ related names — spelling variants, rhymes, alliterations, same-origin matches, and shared meaning concepts — lives at its own URL so each kind of similarity gets a deeper treatment than fits here.
Compare Killian to Other Popular Names
Side-by-side popularity charts and crossover years for Killian against today's most popular boys-name peers (top 8 by US births in the last 10 years of SSA records).