How old is someone named Killian?
The average Killian is 11 years old.
Half of all living Killians are between 5 and 14.
When was Killian popular?
Most of the Killians in the country were born in the last 15 years. The name peaked in 2017 and is still near the top.
Popular names of 2017 · The most popular names of the 2010s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1910s | 5 | 0 |
| 1920s | 5 | 0 |
| 1980s | 160 | 150 |
| 1990s | 1,258 | 1,200 |
| 2000s | 1,971 | 1,900 |
| 2010s | 8,062 | 8,000 |
| 2020s | 5,373 | 5,300 |
How many Killians are still alive?
About 17,000 Killians are alive in the US today. That's 99% of the roughly 17,000 babies named Killian since 1915.
Nearly every Killian ever born is still alive, because almost all of them are young.
What generation is the name Killian?
Three in four living Killians are in Gen Alpha, born in 2013 or later.
- Millennial 6%
- Gen Z 20%
- Gen Alpha 75%
Is Killian an old name?
No. Killian is one of the youngest names around: younger than 92 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Killian will be 25 in 2056, so the name is aging slowly.
Is Killian a boy or girl name?
Mostly boys: 96.3% of living Killians are men.
Names the same age as Killian
NAME TWIN
Killian's name twin is Ariah. Of all 3,713 names on AgeByName, Ariah's age curve is the closest match to Killian's: 91% alike.
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Questions about the name Killian
How old is the average Killian?
The average Killian in the US is 11 years old. The median is 9, so half are older and half younger.
How many people are named Killian?
About 17,000 Killians are alive in the US today, out of roughly 17,000 babies given the name since 1915.
When was the name Killian most popular?
In 2017, when about 1,500 baby boys were named Killian.
Is Killian a Gen Alpha name?
Yes. About 75% of living Killians are in Gen Alpha, born in 2013 or later.
Estimates from Social Security Administration baby-name records (births 1880–2025) and SSA cohort life tables (2026 Trustees Report). Updated each spring. How we calculate this