How Many People Are Named Irby?
An estimated 348 people in the United States have the first name Irby. It is predominantly male (97.7%). The average bearer is 73 years old, and Irby peaked in popularity in 1916 with 39 births that year.
Below you will find a full statistical profile of Irby 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 Irby paired with any surname.
Key Insights
- With an average bearer age of 73, Irby is a vintage name most associated with earlier generations. Most living bearers were born before 1963.
Estimated Living Americans
348
About 1 in 984,926 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
97.7% confidence
Average Age
73
years old
Peak Year
1916
39 births
Total Registered
1,130
since 1880
Gender Distribution for Irby
Irby is predominantly male (97.7%), though 26 female births have been registered. It functions as a unisex name for a small percentage of bearers.
Irby as a male name
Ranked #8,720 in 1991
5 male births in 1991
Peak: 1918 (37 births)
Irby as a female name
Ranked #4,956 in 1943
5 female births in 1943
Peak: 1916 (6 births)
Irby: Popularity Over Time
SSA records for Irby span from the 1890s to the 1990s, covering 11 decades of naming data. The most popular decade for this name was the 1920s, when 266 babies were registered. Irby has declined significantly from its peak in the 1920s. Recent registrations are a fraction of what they were at the name's height.
Irby by Decade
How has Irby 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.
Irby by State
Birth registrations for Irby span all 5 states and territories in the SSA database. The highest counts are in Alabama, Louisiana, Texas. The lowest are in South Carolina, Tennessee, Texas. On average, about 45 Irbys were registered per state.
Irby + Last Name Combinations
How many people share a full name with Irby as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Irby
Other first names starting with I with a similar number of bearers.
Irby: Questions and Answers
How many people in the U.S. are named Irby?
We estimate approximately 348 people named Irby 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 984,926 Americans share this first name.
Is Irby a common name?
Irby is classified as "Very Rare" and is more popular than 80.8% of all first names in the SSA database. A total of 1,130 births have been registered with this name since 1880.
When was Irby most popular?
Irby reached peak popularity in 1916, when 39 babies were given this name. The average age of a living person named Irby is approximately 73 years old, reflecting when the name was most commonly given.
Is Irby a male name?
Irby is predominantly male. 97.7% of people with this name are male. See the gender breakdown above for full details.
How many Irby Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Irby Smith, Irby Johnson, Irby 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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