How old is someone named Sierra?
The average Sierra is 26 years old.
Half of all living Sierras are between 22 and 31.
When was Sierra popular?
Sierra had one big moment, peaking in 1998. 68% of the babies ever named Sierra arrived in a single 15-year stretch.
Popular names of 1998 · The most popular names of the 1990s →
Show the numbers by decade
| Born in | Babies born | Alive today |
|---|---|---|
| 1940s | 144 | under 100 |
| 1950s | 54 | under 100 |
| 1960s | 81 | under 100 |
| 1970s | 822 | 780 |
| 1980s | 8,913 | 8,600 |
| 1990s | 43,746 | 43,000 |
| 2000s | 34,593 | 34,000 |
| 2010s | 9,272 | 9,200 |
| 2020s | 3,241 | 3,200 |
How many Sierras are still alive?
About 99,000 Sierras are alive in the US today. That's 98% of the roughly 100,000 babies named Sierra since 1940.
Nearly every Sierra ever born is still alive, because almost all of them are young.
What generation is the name Sierra?
More than half of living Sierras are in Gen Z, born between 1997 and 2012.
- Gen X 1%
- Millennial 35%
- Gen Z 55%
- Gen Alpha 9%
Is Sierra an old name?
Not really. Sierra is younger than 56 in 100 names on AgeByName.
Looking ahead: if babies keep getting the name at today's pace, the typical Sierra will be 50 in 2056, so the name is getting older.
Is Sierra a boy or girl name?
Almost entirely girls: 99.7% of living Sierras are women.
Names the same age as Sierra
NAME TWIN
Sierra's name twin is Diamond. Of all 3,713 names on AgeByName, Diamond's age curve is the closest match to Sierra's: 93% alike.
Think you can guess a Jessica's age?
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Questions about the name Sierra
How old is the average Sierra?
The average Sierra in the US is 26 years old. The median is 27, so half are older and half younger.
How many people are named Sierra?
About 99,000 Sierras are alive in the US today, out of roughly 100,000 babies given the name since 1940.
When was the name Sierra most popular?
In 1998, when about 5,900 baby girls were named Sierra.
Is Sierra a Gen Z name?
Yes. About 55% of living Sierras are in Gen Z, born between 1997 and 2012.
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