How Many People Are Named Killian?
An estimated 15,886 people in the United States have the first name Killian. It is predominantly male (96.3%). The average bearer is 12 years old, and Killian peaked in popularity in 2017 with 1,527 births that year.
Below you will find a full statistical profile of Killian 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 Killian paired with any surname.
Key Insights
- While Killian is overwhelmingly male, 600 female births have been registered with this name since 1880.
- Killian is a modern name. With an average bearer age of just 12, it has gained most of its popularity in recent years.
Estimated Living Americans
15,886
About 1 in 21,576 people in the U.S.
Rarity
Uncommon
Predicted Gender
Male
96.3% confidence
Average Age
12
years old
Peak Year
2017
1,527 births
Total Registered
16,046
since 1880
Gender Distribution for Killian
Killian is predominantly male (96.3%), though 600 female births have been registered. It functions as a unisex name for a small percentage of bearers.
Killian as a male name
Ranked #369 in 2024
884 male births in 2024
Peak: 2017 (1,505 births)
Killian as a female name
Ranked #8,687 in 2024
12 female births in 2024
Peak: 1997 (33 births)
Killian: Popularity Over Time
SSA records for Killian span from the 1910s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 2010s, when 8,061 babies were registered. While Killian is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Killian by Decade
How has Killian 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.
Killian by State
Birth registrations for Killian span all 50 states and territories in the SSA database. The highest counts are in California, Texas, Florida. The lowest are in Rhode Island, Delaware, Vermont. On average, about 273 Killians were registered per state.
Killian + Last Name Combinations
How many people share a full name with Killian as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Killian
Other first names starting with K with a similar number of bearers.
Killian: Questions and Answers
How many people in the U.S. are named Killian?
We estimate approximately 15,886 people named Killian 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 21,576 Americans share this first name.
Is Killian a common name?
Killian is classified as "Uncommon" and is more popular than 98.3% of all first names in the SSA database. A total of 16,046 births have been registered with this name since 1880.
When was Killian most popular?
Killian reached peak popularity in 2017, when 1,527 babies were given this name. The average age of a living person named Killian is approximately 12 years old, reflecting when the name was most commonly given.
Is Killian a male name?
Killian is predominantly male. 96.3% of people with this name are male. See the gender breakdown above for full details.
How many Killian Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Killian Smith, Killian Johnson, Killian 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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