How Many People Are Named Declan?
An estimated 55,872 people in the United States have the first name Declan. It is predominantly male (99.3%). The average bearer is 11 years old, and Declan peaked in popularity in 2019 with 4,007 births that year.
Below you will find a full statistical profile of Declan 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 Declan paired with any surname.
Key Insights
- While Declan is overwhelmingly male, 386 female births have been registered with this name since 1880.
- Declan is a modern name. With an average bearer age of just 11, it has gained most of its popularity in recent years.
Estimated Living Americans
55,872
About 1 in 6,135 people in the U.S.
Rarity
Uncommon
Predicted Gender
Male
99.3% confidence
Average Age
11
years old
Peak Year
2019
4,007 births
Total Registered
56,351
since 1880
Gender Distribution for Declan
Declan is almost exclusively a male name. Out of 56,351 total births registered, 99.3% were male.
Declan as a male name
Ranked #131 in 2024
2,758 male births in 2024
Peak: 2019 (3,971 births)
Declan as a female name
Ranked #7,662 in 2024
14 female births in 2024
Peak: 2017 (40 births)
Declan: Popularity Over Time
SSA records for Declan span from the 1950s to the 2020s, covering 8 decades of naming data. The most popular decade for this name was the 2010s, when 31,333 babies were registered. While Declan is less common than at its peak in the 2010s, it remains a well-established name with steady registrations.
Declan by Decade
How has Declan 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.
Declan by State
Birth registrations for Declan span all 51 states and territories in the SSA database. The highest counts are in California, New York, Pennsylvania. The lowest are in Hawaii, New Mexico, Wyoming. On average, about 1,077 Declans were registered per state.
Declan + Last Name Combinations
How many people share a full name with Declan as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Declan
Other first names starting with D with a similar number of bearers.
Declan: Questions and Answers
How many people in the U.S. are named Declan?
We estimate approximately 55,872 people named Declan 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 6,135 Americans share this first name.
Is Declan a common name?
Declan is classified as "Uncommon" and is more popular than 99.2% of all first names in the SSA database. A total of 56,351 births have been registered with this name since 1880.
When was Declan most popular?
Declan reached peak popularity in 2019, when 4,007 babies were given this name. The average age of a living person named Declan is approximately 11 years old, reflecting when the name was most commonly given.
Is Declan a male name?
Declan is predominantly male. 99.3% of people with this name are male. See the gender breakdown above for full details.
How many Declan Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Declan Smith, Declan Johnson, Declan 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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