How Many People Are Named Cleo?
An estimated 11,558 people in the United States have the first name Cleo. It is used for both genders, with 74.2% female. The average bearer is 47 years old, and Cleo peaked in popularity in 1920 with 1,399 births that year.
Below you will find a full statistical profile of Cleo 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 Cleo paired with any surname.
Estimated Living Americans
11,558
About 1 in 29,655 people in the U.S.
Rarity
Uncommon
Predicted Gender
Female
74.2% confidence
Average Age
47
years old
Peak Year
1920
1,399 births
Total Registered
44,552
since 1880
Gender Distribution for Cleo
Cleo is a genuinely unisex name, used for both males (25.8%) and females (74.2%). Out of 44,552 total births registered, 11,508 were male and 33,044 were female.
Cleo as a male name
Ranked #4,717 in 2024
21 male births in 2024
Peak: 1918 (363 births)
Cleo as a female name
Ranked #603 in 2024
495 female births in 2024
Peak: 1920 (1,049 births)
Cleo: Popularity Over Time
SSA records for Cleo span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 1920s, when 11,188 babies were registered. Cleo has declined significantly from its peak in the 1920s. Recent registrations are a fraction of what they were at the name's height.
Cleo by Decade
How has Cleo 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 | |
|---|---|---|---|---|
| 1880s | 410 | 52 | 358 | |
| 1890s | 1,319 | 166 | 1,153 | |
| 1900s | 2,878 | 437 | 2,441 | |
| 1910s | 9,716 | 2,348 | 7,368 | |
| 1920s | 11,188 | 2,970 | 8,218 | |
| 1930s | 6,059 | 1,876 | 4,183 | |
| 1940s | 3,509 | 1,270 | 2,239 | |
| 1950s | 2,196 | 875 | 1,321 | |
| 1960s | 1,030 | 452 | 578 | |
| 1970s | 662 | 331 | 331 | |
| 1980s | 544 | 235 | 309 | |
| 1990s | 641 | 170 | 471 | |
| 2000s | 703 | 93 | 610 | |
| 2010s | 1,513 | 135 | 1,378 | |
| 2020s | 2,184 | 98 | 2,086 | |
Cleo by State
Birth registrations for Cleo span all 45 states and territories in the SSA database. The highest counts are in Texas, Oklahoma, North Carolina. The lowest are in Rhode Island, Nevada, Wyoming. On average, about 716 Cleos were registered per state.
Cleo + Last Name Combinations
How many people share a full name with Cleo as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Cleo
Other first names starting with C with a similar number of bearers.
Cleo: Questions and Answers
How many people in the U.S. are named Cleo?
We estimate approximately 11,558 people named Cleo 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 29,655 Americans share this first name.
Is Cleo a common name?
Cleo is classified as "Uncommon" and is more popular than 97.9% of all first names in the SSA database. A total of 44,552 births have been registered with this name since 1880.
When was Cleo most popular?
Cleo reached peak popularity in 1920, when 1,399 babies were given this name. The average age of a living person named Cleo is approximately 47 years old, reflecting when the name was most commonly given.
Is Cleo a female name?
Cleo is predominantly female. 74.2% of people with this name are female. See the gender breakdown above for full details.
How many Cleo Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Cleo Smith, Cleo Johnson, Cleo 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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