How Many People Are Named Cythnia?
An estimated 89 people in the United States have the first name Cythnia. It is almost exclusively a female name. The average bearer is 60 years old, and Cythnia peaked in popularity in 1958 with 10 births that year.
Below you will find a full statistical profile of Cythnia 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 Cythnia paired with any surname.
Key Insights
- Cythnia is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
89
About 1 in 3,851,172 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
60
years old
Peak Year
1958
10 births
Total Registered
108
since 1880
Gender Distribution for Cythnia
Cythnia is almost exclusively a female name. Out of 108 total births registered, 100.0% were female.
Cythnia as a female name
Ranked #10,526 in 1979
5 female births in 1979
Peak: 1958 (10 births)
Cythnia: Popularity Over Time
SSA records for Cythnia span from the 1950s to the 1970s, covering 3 decades of naming data. The most popular decade for this name was the 1960s, when 53 babies were registered. While Cythnia is less common than at its peak in the 1960s, it remains a well-established name with steady registrations.
Cythnia by Decade
How has Cythnia 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.
Cythnia + Last Name Combinations
How many people share a full name with Cythnia as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Cythnia
Other first names starting with C with a similar number of bearers.
Cythnia: Questions and Answers
How many people in the U.S. are named Cythnia?
We estimate approximately 89 people named Cythnia 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 3,851,172 Americans share this first name.
Is Cythnia a common name?
Cythnia is classified as "Very Rare" and is more popular than 62.9% of all first names in the SSA database. A total of 108 births have been registered with this name since 1880.
When was Cythnia most popular?
Cythnia reached peak popularity in 1958, when 10 babies were given this name. The average age of a living person named Cythnia is approximately 60 years old, reflecting when the name was most commonly given.
Is Cythnia a female name?
Cythnia is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Cythnia Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Cythnia Smith, Cythnia Johnson, Cythnia 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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