How Many People Are Named Kirby?
An estimated 14,306 people in the United States have the first name Kirby. It is used for both genders, with 78.8% male. The average bearer is 48 years old, and Kirby peaked in popularity in 1984 with 509 births that year.
Below you will find a full statistical profile of Kirby 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 Kirby paired with any surname.
Estimated Living Americans
14,306
About 1 in 23,959 people in the U.S.
Rarity
Uncommon
Predicted Gender
Male
78.8% confidence
Average Age
48
years old
Peak Year
1984
509 births
Total Registered
18,395
since 1880
Gender Distribution for Kirby
Kirby is a genuinely unisex name, used for both males (78.8%) and females (21.2%). Out of 18,395 total births registered, 14,497 were male and 3,898 were female.
Kirby as a male name
Ranked #2,578 in 2024
52 male births in 2024
Peak: 1957 (358 births)
Kirby as a female name
Ranked #2,539 in 2024
70 female births in 2024
Peak: 1984 (367 births)
Kirby: Popularity Over Time
SSA records for Kirby span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 1950s, when 3,130 babies were registered. Kirby has declined significantly from its peak in the 1950s. Recent registrations are a fraction of what they were at the name's height.
Kirby by Decade
How has Kirby 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.
| Decade | Total | Male | Female | |
|---|---|---|---|---|
| 1880s | 56 | 56 | 0 | |
| 1890s | 93 | 93 | 0 | |
| 1900s | 88 | 88 | 0 | |
| 1910s | 411 | 403 | 8 | |
| 1920s | 631 | 620 | 11 | |
| 1930s | 746 | 731 | 15 | |
| 1940s | 1,610 | 1,509 | 101 | |
| 1950s | 3,130 | 3,009 | 121 | |
| 1960s | 2,460 | 2,352 | 108 | |
| 1970s | 1,674 | 1,589 | 85 | |
| 1980s | 2,802 | 1,338 | 1,464 | |
| 1990s | 2,521 | 1,408 | 1,113 | |
| 2000s | 871 | 596 | 275 | |
| 2010s | 780 | 471 | 309 | |
| 2020s | 522 | 234 | 288 | |
Kirby by State
Birth registrations for Kirby span all 44 states and territories in the SSA database. The highest counts are in Texas, California, Louisiana. The lowest are in Wyoming, District of Columbia, Utah. On average, about 242 Kirbys were registered per state.
Kirby + Last Name Combinations
How many people share a full name with Kirby as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Kirby
Other first names starting with K with a similar number of bearers.
Kirby: Questions and Answers
How many people in the U.S. are named Kirby?
We estimate approximately 14,306 people named Kirby 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 23,959 Americans share this first name.
Is Kirby a common name?
Kirby is classified as "Uncommon" and is more popular than 98.2% of all first names in the SSA database. A total of 18,395 births have been registered with this name since 1880.
When was Kirby most popular?
Kirby reached peak popularity in 1984, when 509 babies were given this name. The average age of a living person named Kirby is approximately 48 years old, reflecting when the name was most commonly given.
Is Kirby a male name?
Kirby is predominantly male. 78.8% of people with this name are male. See the gender breakdown above for full details.
How many Kirby Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Kirby Smith, Kirby Johnson, Kirby 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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