Siera
Recorded 1983–2025 · United States
Siera was most popular in 1998, when 150 American babies were given the name — ranking #2,134 that year. In 2025 it ranked #20,040, with 7 births. Across 1880–2025 the Social Security Administration has recorded 2,543 people named Siera.
Siera over time
How old is the name Siera?
Siera first appears in Social Security Administration records in 1983, which makes it about 42 years old as a recorded American name. It has been recorded in 39 of the 43 years since.
How many people are named Siera?
The Social Security Administration has recorded 2,543 American births named Siera between 1880 and 2025. That is recorded US births, not a world population — it counts people issued a Social Security number at birth in the United States. Of those, roughly 2,504 are estimated to be alive today.
How many babies were named Siera in 2025?
7 American babies were named Siera in 2025, ranking #20,040 that year.
Is Siera getting more or less popular?
Siera is too rare for a direction to mean much. It averaged 8 births a year across 2021–2025 against 17 a year a decade earlier — at these counts a single baby moves the percentage, and any year under five births is withheld at source.
Measured on recorded births. American births overall have fallen since 2007, so most established names lose births over any recent decade — a name can shed births and still hold its rank. Compare the rank above, which is measured against the other names of the same year.
Is Siera a boy’s or a girl’s name?
Across the whole record Siera is a girl’s name — 100.0% of the 2,543 Americans given it were girls and 0.0% were boys. In births since 2016 it is 100% girls and 0% boys.
Counted from every US birth the Social Security Administration recorded under this name, so it reflects use rather than opinion. A name given to fewer than five babies of one sex in a year is withheld at source and is not counted.
How old is someone named Siera?
Roughly 2,504 Americans named Siera are alive today — 99% of everyone ever recorded with the name. The median is 29 years old, and half are between 24 and 34. That is a narrow band: Siera arrived and faded within about a decade rather than staying in steady use.
An estimate, not a count. Recorded births are carried forward through the Social Security Administration’s 2023 period life table, by age and sex. That table describes mortality in one recent year, so it credits the oldest cohorts with today’s survival rather than the harsher rates they actually lived through — the further back a name peaked, the more this will overstate how many remain. It counts people issued a Social Security number at birth, not immigrants who arrived later.
Where Siera is most concentrated
How much more common the name is in each state than across the country as a whole.
Explore further
See Siera on the interactive charts
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Source: U.S.A. Social Security Administration. Years 1880–2025. namelegacy.org