How Many People Are Named Kiernan?
An estimated 2,364 people in the United States have the first name Kiernan. It is used for both genders, with 71.8% male. The average bearer is 21 years old, and Kiernan peaked in popularity in 2008 with 104 births that year.
Below you will find a full statistical profile of Kiernan 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 Kiernan paired with any surname.
Estimated Living Americans
2,364
About 1 in 144,989 people in the U.S.
Rarity
Rare
Predicted Gender
Male
71.8% confidence
Average Age
21
years old
Peak Year
2008
104 births
Total Registered
2,405
since 1880
Gender Distribution for Kiernan
Kiernan is a genuinely unisex name, used for both males (71.8%) and females (28.2%). Out of 2,405 total births registered, 1,727 were male and 678 were female.
Kiernan as a male name
Ranked #3,119 in 2024
39 male births in 2024
Peak: 2008 (77 births)
Kiernan as a female name
Ranked #14,367 in 2024
6 female births in 2024
Peak: 2002 (34 births)
Kiernan: Popularity Over Time
SSA records for Kiernan span from the 1950s to the 2020s, covering 8 decades of naming data. The most popular decade for this name was the 2000s, when 879 babies were registered. Kiernan has declined significantly from its peak in the 2000s. Recent registrations are a fraction of what they were at the name's height.
Kiernan by Decade
How has Kiernan 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.
Kiernan by State
Birth registrations for Kiernan span all 14 states and territories in the SSA database. The highest counts are in New York, California, Massachusetts. The lowest are in Georgia, Connecticut, Colorado. On average, about 30 Kiernans were registered per state.
Kiernan + Last Name Combinations
How many people share a full name with Kiernan as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Kiernan
Other first names starting with K with a similar number of bearers.
Kiernan: Questions and Answers
How many people in the U.S. are named Kiernan?
We estimate approximately 2,364 people named Kiernan 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 144,989 Americans share this first name.
Is Kiernan a common name?
Kiernan is classified as "Rare" and is more popular than 94.3% of all first names in the SSA database. A total of 2,405 births have been registered with this name since 1880.
When was Kiernan most popular?
Kiernan reached peak popularity in 2008, when 104 babies were given this name. The average age of a living person named Kiernan is approximately 21 years old, reflecting when the name was most commonly given.
Is Kiernan a male name?
Kiernan is predominantly male. 71.8% of people with this name are male. See the gender breakdown above for full details.
How many Kiernan Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Kiernan Smith, Kiernan Johnson, Kiernan 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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