How Many People Are Named Sydni?
An estimated 5,231 people in the United States have the first name Sydni. It is almost exclusively a female name. The average bearer is 25 years old, and Sydni peaked in popularity in 2000 with 468 births that year.
Below you will find a full statistical profile of Sydni as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Sydni paired with any surname.
Estimated Living Americans
5,231
About 1 in 65,524 people in the U.S.
Rarity
Rare
Predicted Gender
Female
100.0% confidence
Average Age
25
years old
Peak Year
2000
468 births
Total Registered
5,353
since 1880
Gender Distribution for Sydni
Sydni is almost exclusively a female name. Out of 5,353 total births registered, 100.0% were female.
Sydni as a female name
Ranked #7,528 in 2024
15 female births in 2024
Peak: 2000 (468 births)
Sydni: Popularity Over Time
SSA records for Sydni span from the 1940s to the 2020s, covering 8 decades of naming data. The most popular decade for this name was the 2000s, when 2,503 babies were registered. Sydni has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Sydni by Decade
How has Sydni tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
Sydni by State
Birth registrations for Sydni span all 37 states and territories in the SSA database. The highest counts are in Texas, California, Louisiana. The lowest are in Hawaii, District of Columbia, New Mexico. On average, about 97 Sydnis were registered per state.
Sydni + Last Name Combinations
How many people share a full name with Sydni as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Sydni
Other first names starting with S with a similar number of bearers.
Sydni: Questions and Answers
How many people in the U.S. are named Sydni?
We estimate approximately 5,231 people named Sydni are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 65,524 Americans share this first name.
Is Sydni a common name?
Sydni is classified as "Rare" and is more popular than 96.6% of all first names in the SSA database. A total of 5,353 births have been registered with this name since 1880.
When was Sydni most popular?
Sydni reached peak popularity in 2000, when 468 babies were given this name. The average age of a living person named Sydni is approximately 25 years old, reflecting when the name was most commonly given.
Is Sydni a female name?
Sydni is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Sydni Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Sydni Smith, Sydni Johnson, Sydni Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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