How Many People Are Named Dilys?
An estimated 5 people in the United States have the first name Dilys. It is almost exclusively a female name. The average bearer is 78 years old, and Dilys peaked in popularity in 1915 with 5 births that year.
Below you will find a full statistical profile of Dilys 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 Dilys paired with any surname.
Key Insights
- With an average bearer age of 78, Dilys is a vintage name most associated with earlier generations. Most living bearers were born before 1958.
- Dilys is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
5
About 1 in 68,550,868 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
78
years old
Peak Year
1915
5 births
Total Registered
20
since 1880
Gender Distribution for Dilys
Dilys is almost exclusively a female name. Out of 20 total births registered, 100.0% were female.
Dilys as a female name
Ranked #5,127 in 1946
5 female births in 1946
Peak: 1915 (5 births)
Dilys: Popularity Over Time
SSA records for Dilys span from the 1910s to the 1940s, covering 3 decades of naming data. The most popular decade for this name was the 1940s, when 10 babies were registered. Dilys remains highly popular today, with recent registration numbers near its historical peak.
Dilys by Decade
How has Dilys 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.
Dilys + Last Name Combinations
How many people share a full name with Dilys as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Dilys
Other first names starting with D with a similar number of bearers.
Dilys: Questions and Answers
How many people in the U.S. are named Dilys?
We estimate approximately 5 people named Dilys 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 68,550,868 Americans share this first name.
Is Dilys a common name?
Dilys is classified as "Very Rare" and is more popular than 18.2% of all first names in the SSA database. A total of 20 births have been registered with this name since 1880.
When was Dilys most popular?
Dilys reached peak popularity in 1915, when 5 babies were given this name. The average age of a living person named Dilys is approximately 78 years old, reflecting when the name was most commonly given.
Is Dilys a female name?
Dilys is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Dilys Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Dilys Smith, Dilys Johnson, Dilys 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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