How Many People Are Named Cecillia?
An estimated 505 people in the United States have the first name Cecillia. It is almost exclusively a female name. The average bearer is 29 years old, and Cecillia peaked in popularity in 2007 with 20 births that year.
Below you will find a full statistical profile of Cecillia 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 Cecillia paired with any surname.
Estimated Living Americans
505
About 1 in 678,721 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
29
years old
Peak Year
2007
20 births
Total Registered
556
since 1880
Gender Distribution for Cecillia
Cecillia is almost exclusively a female name. Out of 556 total births registered, 100.0% were female.
Cecillia as a female name
Ranked #10,410 in 2024
9 female births in 2024
Peak: 2007 (20 births)
Cecillia: Popularity Over Time
SSA records for Cecillia span from the 1900s to the 2020s, covering 12 decades of naming data. The most popular decade for this name was the 2000s, when 119 babies were registered. While Cecillia is less common than at its peak in the 2000s, it remains a well-established name with steady registrations.
Cecillia by Decade
How has Cecillia 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.
Cecillia by State
Cecillia + Last Name Combinations
How many people share a full name with Cecillia as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Cecillia
Other first names starting with C with a similar number of bearers.
Cecillia: Questions and Answers
How many people in the U.S. are named Cecillia?
We estimate approximately 505 people named Cecillia 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 678,721 Americans share this first name.
Is Cecillia a common name?
Cecillia is classified as "Very Rare" and is more popular than 84.6% of all first names in the SSA database. A total of 556 births have been registered with this name since 1880.
When was Cecillia most popular?
Cecillia reached peak popularity in 2007, when 20 babies were given this name. The average age of a living person named Cecillia is approximately 29 years old, reflecting when the name was most commonly given.
Is Cecillia a female name?
Cecillia is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Cecillia Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Cecillia Smith, Cecillia Johnson, Cecillia 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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