How Many People Are Named Dillian?
An estimated 599 people in the United States have the first name Dillian. It is almost exclusively a male name. The average bearer is 25 years old, and Dillian peaked in popularity in 1992 with 41 births that year.
Below you will find a full statistical profile of Dillian 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 Dillian paired with any surname.
Estimated Living Americans
599
About 1 in 572,211 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
25
years old
Peak Year
1992
41 births
Total Registered
610
since 1880
Gender Distribution for Dillian
Dillian is almost exclusively a male name. Out of 610 total births registered, 100.0% were male.
Dillian as a male name
Ranked #12,616 in 2021
5 male births in 2021
Peak: 1992 (41 births)
Dillian: Popularity Over Time
SSA records for Dillian span from the 1980s to the 2020s, covering 5 decades of naming data. The most popular decade for this name was the 1990s, when 292 babies were registered. Dillian has declined significantly from its peak in the 1990s. Recent registrations are a fraction of what they were at the name's height.
Dillian by Decade
How has Dillian 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.
Dillian by State
Birth registrations for Dillian span all 4 states and territories in the SSA database. The highest counts are in Ohio, Texas, Alabama. The lowest are in Louisiana, Alabama, Texas. On average, about 6 Dillians were registered per state.
Dillian + Last Name Combinations
How many people share a full name with Dillian as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Dillian
Other first names starting with D with a similar number of bearers.
Dillian: Questions and Answers
How many people in the U.S. are named Dillian?
We estimate approximately 599 people named Dillian 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 572,211 Americans share this first name.
Is Dillian a common name?
Dillian is classified as "Very Rare" and is more popular than 86.2% of all first names in the SSA database. A total of 610 births have been registered with this name since 1880.
When was Dillian most popular?
Dillian reached peak popularity in 1992, when 41 babies were given this name. The average age of a living person named Dillian is approximately 25 years old, reflecting when the name was most commonly given.
Is Dillian a male name?
Dillian is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Dillian Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Dillian Smith, Dillian Johnson, Dillian 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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