How Many People Are Named Jilliann?
An estimated 327 people in the United States have the first name Jilliann. It is almost exclusively a female name. The average bearer is 29 years old, and Jilliann peaked in popularity in 2000 with 17 births that year.
Below you will find a full statistical profile of Jilliann 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 Jilliann paired with any surname.
Estimated Living Americans
327
About 1 in 1,048,178 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
100.0% confidence
Average Age
29
years old
Peak Year
2000
17 births
Total Registered
338
since 1880
Gender Distribution for Jilliann
Jilliann is almost exclusively a female name. Out of 338 total births registered, 100.0% were female.
Jilliann as a female name
Ranked #15,170 in 2016
6 female births in 2016
Peak: 2000 (17 births)
Jilliann: Popularity Over Time
SSA records for Jilliann span from the 1970s to the 2010s, covering 5 decades of naming data. The most popular decade for this name was the 2000s, when 113 babies were registered. While Jilliann is less common than at its peak in the 2000s, it remains a well-established name with steady registrations.
Jilliann by Decade
How has Jilliann 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.
Jilliann by State
Jilliann + Last Name Combinations
How many people share a full name with Jilliann as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Jilliann
Other first names starting with J with a similar number of bearers.
Jilliann: Questions and Answers
How many people in the U.S. are named Jilliann?
We estimate approximately 327 people named Jilliann 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 1,048,178 Americans share this first name.
Is Jilliann a common name?
Jilliann is classified as "Very Rare" and is more popular than 80.2% of all first names in the SSA database. A total of 338 births have been registered with this name since 1880.
When was Jilliann most popular?
Jilliann reached peak popularity in 2000, when 17 babies were given this name. The average age of a living person named Jilliann is approximately 29 years old, reflecting when the name was most commonly given.
Is Jilliann a female name?
Jilliann is predominantly female. 100.0% of people with this name are female. See the gender breakdown above for full details.
How many Jilliann Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Jilliann Smith, Jilliann Johnson, Jilliann 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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