How Many People Are Named Kilby?
An estimated 6 people in the United States have the first name Kilby. It is almost exclusively a male name. The average bearer is 38 years old, and Kilby peaked in popularity in 1987 with 6 births that year.
Below you will find a full statistical profile of Kilby 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 Kilby paired with any surname.
Key Insights
- Kilby is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
6
About 1 in 57,125,723 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
38
years old
Peak Year
1987
6 births
Total Registered
6
since 1880
Gender Distribution for Kilby
Kilby is almost exclusively a male name. Out of 6 total births registered, 100.0% were male.
Kilby as a male name
Ranked #6,569 in 1987
6 male births in 1987
Peak: 1987 (6 births)
Kilby: Popularity Over Time
Kilby by Decade
How has Kilby 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 | |
|---|---|---|---|---|
| 1980s | 6 | 6 | 0 | |
Kilby + Last Name Combinations
How many people share a full name with Kilby as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Kilby
Other first names starting with K with a similar number of bearers.
Kilby: Questions and Answers
How many people in the U.S. are named Kilby?
We estimate approximately 6 people named Kilby 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 57,125,723 Americans share this first name.
Is Kilby a common name?
Kilby is classified as "Very Rare" and is more popular than 22.3% of all first names in the SSA database. A total of 6 births have been registered with this name since 1880.
When was Kilby most popular?
Kilby reached peak popularity in 1987, when 6 babies were given this name. The average age of a living person named Kilby is approximately 38 years old, reflecting when the name was most commonly given.
Is Kilby a male name?
Kilby is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Kilby Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Kilby Smith, Kilby Johnson, Kilby 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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