How Many People Are Named Jillyan?
An estimated 283 people in the United States have the first name Jillyan. It is almost exclusively a female name. The average bearer is 27 years old, and Jillyan peaked in popularity in 1999 with 17 births that year.
Below you will find a full statistical profile of Jillyan 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 Jillyan paired with any surname.
Estimated Living Americans
283
About 1 in 1,211,146 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
27
years old
Peak Year
1999
17 births
Total Registered
291
since 1880
Gender Distribution for Jillyan
Jillyan is almost exclusively a female name. Out of 291 total births registered, 100.0% were female.
Jillyan as a female name
Ranked #15,479 in 2014
6 female births in 2014
Peak: 1999 (17 births)
Jillyan: Popularity Over Time
SSA records for Jillyan span from the 1970s to the 2010s, covering 5 decades of naming data. The most popular decade for this name was the 2000s, when 118 babies were registered. While Jillyan is less common than at its peak in the 2000s, it remains a well-established name with steady registrations.
Jillyan by Decade
How has Jillyan 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.
Jillyan + Last Name Combinations
How many people share a full name with Jillyan as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Jillyan
Other first names starting with J with a similar number of bearers.
Jillyan: Questions and Answers
How many people in the U.S. are named Jillyan?
We estimate approximately 283 people named Jillyan 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 1,211,146 Americans share this first name.
Is Jillyan a common name?
Jillyan is classified as "Very Rare" and is more popular than 78.6% of all first names in the SSA database. A total of 291 births have been registered with this name since 1880.
When was Jillyan most popular?
Jillyan reached peak popularity in 1999, when 17 babies were given this name. The average age of a living person named Jillyan is approximately 27 years old, reflecting when the name was most commonly given.
Is Jillyan a female name?
Jillyan is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Jillyan Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Jillyan Smith, Jillyan Johnson, Jillyan 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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