Killian Boy
How popular is Killian?
#417 boy name in 2025
770 baby boys were named Killian in the US in 2025, making it the 417th most popular boy name. Another 15 girls got the name (#7,131 for girls).
Killian popularity over time
Boys Girls
| Rank in 2025 | #417 for boys (▼ 47 from 2024) |
|---|---|
| Babies in 2025 | 770 boys, 15 girls |
| 10-year trend | Falling (-21% babies vs 2015) |
| Earlier ranks | #349 in 2015, #352 in 2020 |
| Peak year | 2017 (1,506 boys) |
| Highest rank | #248 in 2017 |
| First recorded | 1915 |
| Boys vs girls (last 10 years) | 98% boys, 2% girls |
| Chance a classmate shares it | 0.6% in a class of 25 kids born in 2025 |
Killian counting every spelling
Social Security counts each spelling as its own name. Adding together the spellings that sound alike, the Killian family of names ranked #254 for boys in 2025 (#212 the year before), with 1,434 babies in all.
| Spelling | Boys in 2025 | Share |
|---|---|---|
| Killian | 770 | 54% |
| Kylian | 448 | 31% |
| Kilian | 177 | 12% |
| Kyllian | 21 | 1% |
| Kilyan | 12 | 1% |
| Killion | 6 | 0% |
Spellings are grouped by how they sound, using our own rules, so a few groupings may not match how your family says the name.
Where Killian is most popular
Babies named Killian per 1,000 boys born in each state, 2021 to 2025. Darker means more common.
- Alaska: 2.3 per 1,000 (27 boys)
- West Virginia: 1.1 per 1,000 (37 boys)
- South Dakota: 1.1 per 1,000 (21 boys)
- North Dakota: 1.1 per 1,000 (19 boys)
- Idaho: 1.0 per 1,000 (39 boys)
Killian by decade
| Decade | Baby boys | Best rank |
|---|---|---|
| 1910s | 5 | #3,824 |
| 1920s | 5 | #4,284 |
| 1980s | 132 | #1,511 |
| 1990s | 1,090 | #906 |
| 2000s | 1,824 | #752 |
| 2010s | 7,883 | #248 |
| 2020s | 5,280 | #347 |
Boy names about as popular as Killian
Questions
- Is Killian a boy or girl name?
- Killian is mostly a boy name. Over the last 10 years, 98% of babies named Killian were boys.
- How popular is the name Killian?
- 770 baby boys were named Killian in the US in 2025, making it the 417th most popular boy name. Another 15 girls got the name (#7,131 for girls).
- When was Killian most popular?
- Killian peaked in 2017, when 1,506 boys were given the name. Its highest rank was #248 in 2017.
- How many people are named Killian?
- 16,834 babies have been named Killian in the US since 1880. We estimate about 16,686 of them are alive in 2026, with a median age of 9.
- Where is Killian most popular?
- From 2021 to 2025, Killian was most common in Alaska, at 2.3 of every 1,000 boys born there.
Source: Social Security Administration baby name data, 1880 to 2025 (names given to at least 5 babies of a sex in a year). Living-people and median-age figures are our estimates using US life tables. How we calculate.