How Many People Are Named Sian?
An estimated 959 people in the United States have the first name Sian. It is used for both genders, with 85.4% female. The average bearer is 27 years old, and Sian peaked in popularity in 2002 with 36 births that year.
Below you will find a full statistical profile of Sian 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 Sian paired with any surname.
Estimated Living Americans
959
About 1 in 357,408 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
85.4% confidence
Average Age
27
years old
Peak Year
2002
36 births
Total Registered
999
since 1880
Gender Distribution for Sian
Sian is predominantly female (85.4%), though 146 male births have been registered. It functions as a unisex name for a small percentage of bearers.
Sian as a male name
Ranked #8,841 in 2024
9 male births in 2024
Peak: 2021 (14 births)
Sian as a female name
Ranked #11,965 in 2024
8 female births in 2024
Peak: 2006 (35 births)
Sian: Popularity Over Time
SSA records for Sian span from the 1960s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 2000s, when 277 babies were registered. While Sian is less common than at its peak in the 2000s, it remains a well-established name with steady registrations.
Sian by Decade
How has Sian 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.
Sian by State
Birth registrations for Sian span all 3 states and territories in the SSA database. The highest counts are in California, New York, Texas. The lowest are in Texas, New York, California. On average, about 18 Sians were registered per state.
Sian + Last Name Combinations
How many people share a full name with Sian as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Sian
Other first names starting with S with a similar number of bearers.
Sian: Questions and Answers
How many people in the U.S. are named Sian?
We estimate approximately 959 people named Sian 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 357,408 Americans share this first name.
Is Sian a common name?
Sian is classified as "Very Rare" and is more popular than 89.8% of all first names in the SSA database. A total of 999 births have been registered with this name since 1880.
When was Sian most popular?
Sian reached peak popularity in 2002, when 36 babies were given this name. The average age of a living person named Sian is approximately 27 years old, reflecting when the name was most commonly given.
Is Sian a female name?
Sian is predominantly female. 85.4% of people with this name are female. See the gender breakdown above for full details.
How many Sian Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Sian Smith, Sian Johnson, Sian 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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