How old is someone named Kieran?
The average Kieran is 18 years old.
Half of all living Kierans are between 8 and 25.
When was Kieran popular?
Most of the Kierans in the country were born in the last 15 years. The name peaked in 2025 and is still near the top.
Popular names of 2025 · The most popular names of the 2020s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1910s | 8 | 0 |
| 1920s | 38 | 0 |
| 1930s | 48 | under 100 |
| 1940s | 86 | under 100 |
| 1950s | 233 | 160 |
| 1960s | 423 | 350 |
| 1970s | 474 | 430 |
| 1980s | 729 | 690 |
| 1990s | 2,504 | 2,400 |
| 2000s | 5,003 | 4,900 |
| 2010s | 5,623 | 5,600 |
| 2020s | 4,049 | 4,000 |
How many Kierans are still alive?
About 19,000 Kierans are alive in the US today. That's 97% of the roughly 19,000 babies named Kieran since 1918.
Nearly every Kieran ever born is still alive, because almost all of them are young.
What generation is the name Kieran?
About two in five living Kierans are in Gen Alpha, born in 2013 or later.
- Boomer 2%
- Gen X 4%
- Millennial 11%
- Gen Z 41%
- Gen Alpha 43%
Is Kieran an old name?
Not really. Kieran is younger than 74 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Kieran will be 29 in 2056, so the name is aging slowly.
Is Kieran a boy or girl name?
Mostly a boy's name: 92% of living Kierans are men, and 8% are women.
The women average 24 and the men 18.
Names the same age as Kieran
NAME TWIN
Kieran's name twin is Isaias. Of all 3,713 names on AgeByName, Isaias's age curve is the closest match to Kieran's: 95% alike.
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Questions about the name Kieran
How old is the average Kieran?
The average Kieran in the US is 18 years old. The median is 16, so half are older and half younger.
How many people are named Kieran?
About 19,000 Kierans are alive in the US today, out of roughly 19,000 babies given the name since 1918.
When was the name Kieran most popular?
In 2025, when about 830 baby boys were named Kieran.
Is Kieran a Gen Alpha name?
Partly. Gen Alpha are the largest group, about 43% of living Kierans, but the name spans several generations.
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