How Many People Are Named Onni?
An estimated 47 people in the United States have the first name Onni. It is almost exclusively a male name. The average bearer is 7 years old, and Onni peaked in popularity in 2017 with 8 births that year.
Below you will find a full statistical profile of Onni 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 Onni paired with any surname.
Key Insights
- Onni is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
47
About 1 in 7,292,645 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
7
years old
Peak Year
2017
8 births
Total Registered
79
since 1880
Gender Distribution for Onni
Onni is almost exclusively a male name. Out of 79 total births registered, 100.0% were male.
Onni as a male name
Ranked #10,600 in 2024
7 male births in 2024
Peak: 2017 (8 births)
Onni: Popularity Over Time
SSA records for Onni span from the 1910s to the 2020s, covering 3 decades of naming data. The most popular decade for this name was the 2020s, when 34 babies were registered. Onni remains highly popular today, with recent registration numbers near its historical peak.
Onni by Decade
How has Onni 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.
Onni + Last Name Combinations
How many people share a full name with Onni as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Onni
Other first names starting with O with a similar number of bearers.
Onni: Questions and Answers
How many people in the U.S. are named Onni?
We estimate approximately 47 people named Onni 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 7,292,645 Americans share this first name.
Is Onni a common name?
Onni is classified as "Very Rare" and is more popular than 53.4% of all first names in the SSA database. A total of 79 births have been registered with this name since 1880.
When was Onni most popular?
Onni reached peak popularity in 2017, when 8 babies were given this name. The average age of a living person named Onni is approximately 7 years old, reflecting when the name was most commonly given.
Is Onni a male name?
Onni is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Onni Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Onni Smith, Onni Johnson, Onni 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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