Killian
- US rank
- #417
- Syllables
- 2
- Peak
- #248 in 2017
770 babies were named Killian in the US in 2025. It has dropped 65 places in five years.
Found on lists
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US births per million boys, 1915–2025
Most popular states (2025)
Similar names
Popularity: U.S. Social Security Administration (babies with 5+ births per year).
Did you know?
A few things about Killian you might not know, from US birth records. Handy for convincing a partner, or a grandparent.
- How commonAbout 1 in every 2,218 baby boys born in the US in 2025 was named Killian, 770 babies in all. In a typical school of 500 kids, your Killian would very likely be the only one.
- HistoryKillian first shows up in US birth records in 1915, the first year at least 5 babies got it. It has been in use for 110 years since.
- Best yearIts best year was 2017, when it reached #248.
- Then vs nowKillian is 6.4× more common today than it was in 2000. In 2000 it was given to about 1 in 14,124 baby boys; in 2025, about 1 in 2,218.
- TrendKillian has slipped 65 places over the last five years and now sits at #417. Good news if you want a familiar name that fewer kids will share.
- Where it's lovedKillian is most popular in Vermont, where it ranks #102, followed by South Dakota (#221) and West Virginia (#254). It makes the top 1,000 in almost every state.
About the name Killian
Killian is a boy name of Celtic origin. It has 7 letters and 2 syllables, starting with K and ending in “-ian”. US birth records list Killian for boys from 1915 to 2025, in 46 of those 111 years. Its best year was 2017, when it ranked #248 among boy names. In 2025 it ranked #417, with 770 babies.
Origin:Celtic names
| Decade | Babies per million | About 1 in |
|---|---|---|
| 1910s | 1.2 | 847,458 boys |
| 1920s | 0.5 | 2,127,660 boys |
| 1980s | 6.9 | 144,509 boys |
| 1990s | 56 | 17,749 boys |
| 2000s | 91 | 10,989 boys |
| 2010s | 423 | 2,366 boys |
| 2020s | 509 | 1,963 boys |
Other spellings of Killian
More Celtic boy names
- Unisex name: Owen · well-born
- Unisex name: Logan · little hollow
- Unisex name: Rowan · little red-haired one
- Unisex name: Nolan · descendant of Nuallán
- Unisex name: Cameron · crooked nose
- Boy name: Ian · God is gracious
- Unisex name: Gael · a Gael
- Boy name: Arthur · possibly bear
Questions about the name Killian
What is the origin of the name Killian?
Killian has Celtic roots in our records. Other Celtic names include Owen, Logan, Rowan.
Is Killian a boy or girl name?
Killian is a boy name, though a few girls get it too.
How popular is the name Killian?
Killian ranked #417 for US boys in 2025, given to 770 babies. Its best year was 2017 (#248).