How Many People Are Named Onyx?
An estimated 7,518 people in the United States have the first name Onyx. It is used for both genders, with 78.5% male. The average bearer is 7 years old, and Onyx peaked in popularity in 2023 with 1,269 births that year.
Below you will find a full statistical profile of Onyx 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 Onyx paired with any surname.
Key Insights
- Onyx is a modern name. With an average bearer age of just 7, it has gained most of its popularity in recent years.
Estimated Living Americans
7,518
About 1 in 45,591 people in the U.S.
Rarity
Rare
Predicted Gender
Male
78.5% confidence
Average Age
7
years old
Peak Year
2023
1,269 births
Total Registered
7,581
since 1880
Gender Distribution for Onyx
Onyx is a genuinely unisex name, used for both males (78.5%) and females (21.5%). Out of 7,581 total births registered, 5,954 were male and 1,627 were female.
Onyx as a male name
Ranked #358 in 2024
927 male births in 2024
Peak: 2023 (1,077 births)
Onyx as a female name
Ranked #1,248 in 2024
186 female births in 2024
Peak: 2023 (192 births)
Onyx: Popularity Over Time
SSA records for Onyx span from the 1910s to the 2020s, covering 6 decades of naming data. The most popular decade for this name was the 2020s, when 4,989 babies were registered. Onyx remains highly popular today, with recent registration numbers near its historical peak.
Onyx by Decade
How has Onyx 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.
Onyx by State
Birth registrations for Onyx span all 44 states and territories in the SSA database. The highest counts are in California, Texas, Florida. The lowest are in Delaware, District of Columbia, South Dakota. On average, about 127 Onyxs were registered per state.
Onyx + Last Name Combinations
How many people share a full name with Onyx as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Onyx
Other first names starting with O with a similar number of bearers.
Onyx: Questions and Answers
How many people in the U.S. are named Onyx?
We estimate approximately 7,518 people named Onyx 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 45,591 Americans share this first name.
Is Onyx a common name?
Onyx is classified as "Rare" and is more popular than 97.3% of all first names in the SSA database. A total of 7,581 births have been registered with this name since 1880.
When was Onyx most popular?
Onyx reached peak popularity in 2023, when 1,269 babies were given this name. The average age of a living person named Onyx is approximately 7 years old, reflecting when the name was most commonly given.
Is Onyx a male name?
Onyx is predominantly male. 78.5% of people with this name are male. See the gender breakdown above for full details.
How many Onyx Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Onyx Smith, Onyx Johnson, Onyx 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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