Siera
Siera was given to 7 girls in 2025, #12,986 among girls’ names; 2,543 Americans have been recorded with it since 1983 (Social Security Administration, published May 2026).
An estimated 2,500 Americans named Siera and born in the U.S. are alive in 2026 (98% of everyone recorded); the median is 29 years old and half are between 24 and 34.
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Siera by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
How popular is Siera?
#12,986 among girls’ names, 2025
Siera entered the girls’ rankings after 2015 and stood at #12,986 in 2025.
150 babies in 1998, the peak
Siera peaked in 1998, when 150 girls were given it, #1,223 among girls’ names. The 7 births of 2025 are 5% of that peak.
| Year | Births | Rank | Per million girls |
|---|---|---|---|
| 2025 | 7 | #12,986 | 4.4 |
| 2024 | 8 | #12,005 | 4.9 |
| 2022 | 8 | #12,091 | 4.9 |
| 2020 | 6 | #14,858 | 3.7 |
| 2018 | 8 | #12,329 | 4.7 |
| 2017 | 10 | #10,591 | 5.8 |
| 2016 | 8 | #12,729 | 4.5 |
| 2014 | 17 | #7,257 | 9.5 |
| 2013 | 16 | #7,697 | 9.1 |
| 2012 | 16 | #7,750 | 9.1 |
Every recorded year (39)
| Year | Births | Rank | Per million girls |
|---|---|---|---|
| 2011 | 20 | #6,526 | 11.4 |
| 2010 | 28 | #5,086 | 15.8 |
| 2009 | 22 | #6,282 | 12.0 |
| 2008 | 53 | #3,214 | 28.0 |
| 2007 | 48 | #3,473 | 25.0 |
| 2006 | 81 | #2,346 | 42.6 |
| 2005 | 77 | #2,336 | 41.7 |
| 2004 | 87 | #2,096 | 47.4 |
| 2003 | 86 | #2,081 | 47.1 |
| 2002 | 110 | #1,680 | 61.2 |
| 2001 | 114 | #1,617 | 63.3 |
| 2000 | 121 | #1,513 | 66.6 |
| 1999 | 116 | #1,488 | 65.4 |
| 1998 | 150 | #1,223 | 84.9 |
| 1997 | 132 | #1,316 | 75.8 |
| 1996 | 149 | #1,205 | 85.0 |
| 1995 | 114 | #1,428 | 64.8 |
| 1994 | 137 | #1,254 | 76.7 |
| 1993 | 130 | #1,305 | 71.9 |
| 1992 | 99 | #1,569 | 53.7 |
| 1991 | 125 | #1,323 | 66.7 |
| 1990 | 94 | #1,599 | 49.5 |
| 1989 | 75 | #1,798 | 40.7 |
| 1988 | 67 | #1,856 | 37.6 |
| 1987 | 70 | #1,729 | 40.3 |
| 1986 | 76 | #1,584 | 44.3 |
| 1985 | 46 | #2,249 | 26.7 |
| 1984 | 7 | #9,001 | 4.2 |
| 1983 | 5 | #11,798 | 3.0 |
Ranks and shares: girls’ names in each year’s SSA file; share of all girls SSA recorded that year.
Is Siera a boy’s or a girl’s name?
Siera has been recorded only for girls: SSA lists no boys with the name in 39 years of records (it lists a name only in years with 5 or more babies of a sex).
Girls and boys named Siera: the SSA national file counts each sex separately.
How many people are named Siera, and how old are they?
2,500 alive in 2026, estimated
That is 98% of the 2,543 Americans ever recorded as Siera. The median Siera alive today is 29 years old; half are between 24 and 34.
The 2020 Census counted 2,381 people named Siera (2,370 women and girls, 11 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 2,483 born in the U.S. The Census count is 4% below that prediction.
Alive today, by age
Alive today, by generation
| Generation | Born | Alive |
|---|---|---|
| Millennials | 1981-1996 | 1,170 |
| Generation Z | 1997-2012 | 1,250 |
| Generation Alpha | 2013-2025 | 87 |
An estimate, not a count. SSA’s files count people born in the United States who received a Social Security number, so anyone born abroad is not in them; before 1937 most people got a number as adults, and their survival is counted from that age.
Living estimate: SSA births carried forward with the survival rates in SSA’s cohort life tables (2024 Trustees Report) for each birth year and sex. How the estimate is made. Count: Census Bureau, first names in the 2020 Census (released April 14, 2026; names reported 100 or more times, with the Bureau’s disclosure-avoidance adjustment).
Where are babies named Siera born?
The states with the most babies named Siera are California, Florida and Ohio, with 46% of its births recorded by state since 1910.
| State | Since 1910 | Rank, girls | vs. national |
|---|---|---|---|
| California | 198 | not ranked | 0.6× |
| Florida | 134 | not ranked | 1.1× |
| Ohio | 129 | not ranked | 1.2× |
| Texas | 76 | not ranked | 0.3× |
| New York | 73 | not ranked | 0.4× |
| Michigan | 64 | not ranked | 0.7× |
| Indiana | 55 | not ranked | 0.9× |
| North Carolina | 40 | not ranked | 0.6× |
| Illinois | 37 | not ranked | 0.3× |
| Pennsylvania | 24 | not ranked | 0.2× |
Where Siera is more common than its national share predicts
Relative to its national share, Siera is most over-represented in Ohio: since 1983 it was given 1.2 times as often there as its national share each year would predict.
States: SSA state file, 1910-2025, published May 8, 2026; births count girls and boys together, and the rank is among girls’ names in the state in 2025. The file leaves out any state and year with fewer than 5 babies of the name, so small states are undercounted; each ratio compares the state’s births of Siera with the births its national share predicts year by year, for states with at least 100 births of the name.
How common is the spelling Siera?
Siera is a less common spelling of Sierra: SSA has recorded 2,543 Siera and 100,866 Sierra since 1880.
Of these 8 names spelled alike, given to 110,595 babies since 1880, Siera is the second most given (2.3% of them). In 2025 it was given to 7 of their 600 babies (1.2%), the fourth most given that year.
Spelled alike: names in the SSA national file with the same pattern of letters and sounds and at most two letters apart, and Wiktionary’s listed forms; births since 1880 and in 2025, and each name’s peak year, from the SSA national file, published May 8, 2026. Some are separate names, not spellings of one.
Names that rose and fell in the same decades as Siera
Names whose births rose and fell across the same decades, measured on each decade’s share of births.
Similar histories: each decade’s share of births, from the SSA national file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
More about Siera and names like it
- Compare Siera and SierraBirths, ranks, peak and the living estimate side by side.
- The most given names of the 1990sSiera peaked in 1998.
- California’s most given namesThe state where SSA recorded the most babies named Siera since 1910.
- The top names of 1998The year the most babies were named Siera.
- The names of Generation ZMost people named Siera alive today were born 1997-2012.
- Names starting with SMost given first.