Sidni
Sidni was last recorded in 2013, when 5 babies were given it; 236 Americans have been recorded with it between 1949 and 2013 (Social Security Administration, published May 2026).
Girls and boys together; gaps are years SSA did not record (fewer than 5 births).
Births of Sidni by year: SSA national baby-name file, 1880-2025, published May 8, 2026. SSA’s notes on the data.
How popular is Sidni?
Unranked in 2025
Its last girls’ rank on record is #18,889, in 2013; SSA lists a name only in years with 5 or more births.
21 babies in 1995, the peak
Sidni peaked in 1995, when 21 girls were given it, #4,819 among girls’ names. It was not recorded in 2025.
| Year | Births | Rank | Per million girls |
|---|---|---|---|
| 2013 | 5 | #18,889 | 2.8 |
| 2011 | 7 | #14,628 | 4.0 |
| 2009 | 6 | #16,990 | 3.3 |
| 2008 | 5 | #20,052 | 2.6 |
| 2006 | 8 | #13,448 | 4.2 |
| 2005 | 11 | #10,017 | 6.0 |
| 2004 | 12 | #9,185 | 6.5 |
| 2003 | 13 | #8,415 | 7.1 |
| 2002 | 13 | #8,216 | 7.2 |
| 2001 | 13 | #8,123 | 7.2 |
Every recorded year (22)
| Year | Births | Rank | Per million girls |
|---|---|---|---|
| 2000 | 18 | #6,172 | 9.9 |
| 1999 | 19 | #5,621 | 10.7 |
| 1998 | 10 | #9,174 | 5.7 |
| 1997 | 16 | #6,123 | 9.2 |
| 1996 | 7 | #11,627 | 4.0 |
| 1995 | 21 | #4,819 | 11.9 |
| 1994 | 13 | #7,026 | 7.3 |
| 1993 | 8 | #10,445 | 4.4 |
| 1992 | 8 | #10,338 | 4.3 |
| 1991 | 10 | #8,517 | 5.3 |
| 1989 | 8 | #9,552 | 4.3 |
| 1949 | 5 | #5,949 | 2.9 |
Ranks and shares: girls’ names in each year’s SSA file; share of all girls SSA recorded that year.
Is Sidni a boy’s or a girl’s name?
Sidni has been recorded only for girls: SSA lists no boys with the name in 22 years of records (it lists a name only in years with 5 or more babies of a sex).
Girls and boys named Sidni: the SSA national file counts each sex separately.
How many people are named Sidni, and how old are they?
An estimated 231 Americans named Sidni and born in the U.S. are alive in 2026 (98% of everyone recorded); the median is 27 years old and half are between 23 and 31. An estimate from SSA’s births and life tables, not a count.
The 2020 Census counted 297 people named Sidni (294 women and girls, 3 men and boys). SSA’s births carried forward to Census day, April 1, 2020, predict 232 born in the U.S. The Census count is 28% above that prediction. Possible reasons: the Census counts people born abroad, whom SSA’s files leave out, and it records the name people give, which SSA may have recorded under another spelling or as part of a compound name.
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).
How common is the spelling Sidni?
Sidni is a less common spelling of Sydney: SSA has recorded 236 Sidni and 187,700 Sydney since 1880.
Of these 8 names spelled alike, given to 201,029 babies since 1880, Sidni is the eighth most given (<1% of them). In 2025 none of their 910 babies recorded by SSA was a Sidni (SSA lists a name only with 5 or more babies of one sex).
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 Sidni
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 Sidni and names like it
- Compare Sidni and SydneyBirths, ranks, peak and the living estimate side by side.
- The most given names of the 1990sSidni peaked in 1995.
- The top names of 1995The year the most babies were named Sidni.
- The names of Generation ZMost people named Sidni alive today were born 1997-2012.
- Names starting with SMost given first.