How old is someone named Sullivan?
The average Sullivan is 11 years old.
Half of all living Sullivans are between 4 and 15.
When was Sullivan popular?
Most of the Sullivans 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 |
|---|---|---|
| 1900s | 10 | 0 |
| 1910s | 122 | 0 |
| 1920s | 141 | 0 |
| 1930s | 110 | under 100 |
| 1940s | 114 | under 100 |
| 1950s | 129 | under 100 |
| 1960s | 85 | under 100 |
| 1970s | 86 | under 100 |
| 1980s | 83 | under 100 |
| 1990s | 619 | 600 |
| 2000s | 2,382 | 2,400 |
| 2010s | 7,033 | 7,000 |
| 2020s | 6,070 | 6,000 |
How many Sullivans are still alive?
About 16,000 Sullivans are alive in the US today. That's 96% of the roughly 17,000 babies named Sullivan since 1884.
Nearly every Sullivan ever born is still alive, because almost all of them are young.
What generation is the name Sullivan?
About two in three living Sullivans are in Gen Alpha, born in 2013 or later.
- Boomer under 1%
- Gen X under 1%
- Millennial 2%
- Gen Z 25%
- Gen Alpha 71%
Is Sullivan an old name?
No. Sullivan is one of the youngest names around: younger than 91 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Sullivan will be 24 in 2056, so the name is aging slowly.
Is Sullivan a boy or girl name?
Mostly a boy's name: 91% of living Sullivans are men, and 9% are women.
The women average 11 and the men 11.
Names the same age as Sullivan
NAME TWIN
Sullivan's name twin is Ellie. Of all 3,713 names on AgeByName, Ellie's age curve is the closest match to Sullivan's: 95% alike.
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Questions about the name Sullivan
How old is the average Sullivan?
The average Sullivan in the US is 11 years old. The median is 9, so half are older and half younger.
How many people are named Sullivan?
About 16,000 Sullivans are alive in the US today, out of roughly 17,000 babies given the name since 1884.
When was the name Sullivan most popular?
In 2025, when about 1,200 baby boys were named Sullivan.
Is Sullivan a Gen Alpha name?
Yes. About 71% of living Sullivans 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