How Many People Are Named Sonji?
An estimated 772 people in the United States have the first name Sonji. It is almost exclusively a female name. The average bearer is 58 years old, and Sonji peaked in popularity in 1966 with 225 births that year.
Below you will find a full statistical profile of Sonji 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 Sonji paired with any surname.
Estimated Living Americans
772
About 1 in 443,982 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
58
years old
Peak Year
1966
225 births
Total Registered
904
since 1880
Gender Distribution for Sonji
Sonji is almost exclusively a female name. Out of 904 total births registered, 100.0% were female.
Sonji as a female name
Ranked #12,928 in 1991
6 female births in 1991
Peak: 1966 (225 births)
Sonji: Popularity Over Time
SSA records for Sonji span from the 1950s to the 1990s, covering 5 decades of naming data. The most popular decade for this name was the 1960s, when 629 babies were registered. Sonji has declined significantly from its peak in the 1960s. Recent registrations are a fraction of what they were at the name's height.
Sonji by Decade
How has Sonji 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.
Sonji by State
Birth registrations for Sonji span all 19 states and territories in the SSA database. The highest counts are in Illinois, Georgia, New York. The lowest are in South Carolina, Wisconsin, Maryland. On average, about 24 Sonjis were registered per state.
Sonji + Last Name Combinations
How many people share a full name with Sonji as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Sonji
Other first names starting with S with a similar number of bearers.
Sonji: Questions and Answers
How many people in the U.S. are named Sonji?
We estimate approximately 772 people named Sonji 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 443,982 Americans share this first name.
Is Sonji a common name?
Sonji is classified as "Very Rare" and is more popular than 88.3% of all first names in the SSA database. A total of 904 births have been registered with this name since 1880.
When was Sonji most popular?
Sonji reached peak popularity in 1966, when 225 babies were given this name. The average age of a living person named Sonji is approximately 58 years old, reflecting when the name was most commonly given.
Is Sonji a female name?
Sonji is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Sonji Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Sonji Smith, Sonji Johnson, Sonji 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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