How Many People Are Named Onnyx?
An estimated 5 people in the United States have the first name Onnyx. It is almost exclusively a male name. The average bearer is 2 years old, and Onnyx peaked in popularity in 2024 with 5 births that year.
Below you will find a full statistical profile of Onnyx 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 Onnyx paired with any surname.
Key Insights
- Onnyx 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
Male
100.0% confidence
Average Age
2
years old
Peak Year
2024
5 births
Total Registered
5
since 1880
Gender Distribution for Onnyx
Onnyx is almost exclusively a male name. Out of 5 total births registered, 100.0% were male.
Onnyx as a male name
Ranked #13,659 in 2024
5 male births in 2024
Peak: 2024 (5 births)
Onnyx: Popularity Over Time
Onnyx by Decade
How has Onnyx 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.
| Decade | Total | Male | Female | |
|---|---|---|---|---|
| 2020s | 5 | 5 | 0 | |
Onnyx + Last Name Combinations
How many people share a full name with Onnyx as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Onnyx
Other first names starting with O with a similar number of bearers.
Onnyx: Questions and Answers
How many people in the U.S. are named Onnyx?
We estimate approximately 5 people named Onnyx 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 Onnyx a common name?
Onnyx is classified as "Very Rare" and is more popular than 18.2% of all first names in the SSA database. A total of 5 births have been registered with this name since 1880.
When was Onnyx most popular?
Onnyx reached peak popularity in 2024, when 5 babies were given this name. The average age of a living person named Onnyx is approximately 2 years old, reflecting when the name was most commonly given.
Is Onnyx a male name?
Onnyx is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Onnyx Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Onnyx Smith, Onnyx Johnson, Onnyx 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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