How Many People Are Named Declan Williams?
There are approximately 308 people named Declan Williams living in the United States today. That makes this name combination uncommon, occurring at a rate of about 1 in 1,112,839 Americans.
This estimate combines SSA birth records for the first name Declan with Census Bureau frequency data for the surname Williams. Below you will find a breakdown of both names, including popularity trends, gender data, and ancestry information.
Estimated People with This Name
308
1 in 1,112,839 Americans
Combination Rarity
Uncommon
First Name
View full profileDeclan
Last Name
View full profileWilliams
Declan: Popularity Over Time
Year-by-year SSA birth registrations for the first name Declan. The peak year was 2019 with 4,007 births. The average person named Declan today is 11 years old.
Ancestry of the Williams Surname
Self-reported race and ethnicity breakdown for people with the surname Williams, from the 2010 U.S. Census Bureau.
How we calculated this
The first name "Declan" has an estimated frequency of 0.0163% among living Americans, based on SSA birth records from 1880 to 2024 adjusted for mortality using CDC 2023 life tables.
The surname "Williams" appears at a rate of 550.97 per 100,000 people in the 2010 U.S. Census.
Multiplying these frequencies against the U.S. population of ~343 million gives 308 estimated people. This assumes first names and last names are statistically independent. Full methodology.
Other people named Declan
Other people with the surname Williams
Declan Williams: Questions and Answers
How many people are named Declan Williams?
We estimate approximately 308 people named Declan Williams are alive in the United States today. The first name Declan is shared by 55,872 Americans, and the surname Williams is shared by 1,850,671.
How rare is the name Declan Williams?
This name combination is classified as Uncommon, occurring at a rate of about 1 in 1,112,839 Americans. The first name Declan is uncommon and the surname Williams is very common.
Is Declan a male or female name?
Declan is predominantly male, with 99.3% of bearers being male and 0.7% female. It peaked in popularity in 2019 and the average bearer today is 11 years old.
Where does this data come from?
First name data comes from the Social Security Administration (1880 to 2024), adjusted for survival using CDC 2023 life tables. Surname data comes from the 2010 U.S. Census Bureau. Full methodology.
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