How Many People Are Named Cillian Smith?
There are approximately 29 people named Cillian Smith living in the United States today. That makes this name combination rare, occurring at a rate of about 1 in 11,819,115 Americans.
This estimate combines SSA birth records for the first name Cillian with Census Bureau frequency data for the surname Smith. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Estimated People with This Name
29
1 in 11,819,115 Americans
Combination Rarity
Rare
First Name
View full profileCillian
Last Name
View full profileSmith
Cillian: Popularity Over Time
Year-by-year SSA birth registrations for the first name Cillian. The peak year was 2024 with 674 births. The average person named Cillian today is 7 years old.
Ancestry of the Smith Surname
Self-reported race and ethnicity breakdown for people with the surname Smith, from the 2010 U.S. Census Bureau.
How we calculated this
The first name "Cillian" has an estimated frequency of < 0.0001% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Smith" appears at a rate of 828.19 per 100,000 people in the 2010 U.S. Census.
Multiplying these frequencies against the U.S. population of ~343 million gives 29 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Cillian
Other people with the surname Smith
Cillian Smith: Questions and Answers
How many people are named Cillian Smith?
We estimate approximately 29 people named Cillian Smith are alive in the United States today. The first name Cillian is shared by 3,467 Americans, and the surname Smith is shared by 2,781,834.
How rare is the name Cillian Smith?
This name combination is classified as Rare, occurring at a rate of about 1 in 11,819,115 Americans. The first name Cillian is rare and the surname Smith is very common.
Is Cillian a male or female name?
Cillian is predominantly male, with 99.8% of bearers being male and 0.2% female. It peaked in popularity in 2024 and the average bearer today is 7 years old.
Where does this data come from?
First name data comes from the Social Security Administration (1880 to 2024), adjusted for survival using CDC 2023 life tables. Surname data comes from the 2010 U.S. Census Bureau. Full methodology.
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